Account, Campaign, Ad Group Hierarchy — and Why Getting It Wrong Burns Budget

Structure is not filing cabinets — it decides which settings you can even set independently, and getting the split wrong (by match type, by single-keyword ad group) starves Smart Bidding of the data it needs. This page maps what lives at which level and what Google's own current guidance says to consolidate rather than fragment.

The hierarchy: account → campaign → ad group → ads/keywords

Google Ads has three organizational levels: Account (top tier, associated with a unique email, password, and billing information), Campaign (its own budget and settings that determine where ads appear), and Ad Group (base level, containing a set of similar ads and keywords that trigger ad appearance) — support.google.com/google-ads/answer/1704396.

Performance Max exception

the hierarchy differs for Performance Max campaigns — Account > Campaign > Asset groups replace Ad groups as the base unit (support.google.com/google-ads/answer/1704396). See Google Ads Campaign Types: What Each One Is For — Picking the Right Inventory Before You Set Up or Audit an Account for how PMax's automated structure compares to Search, and Ad Assets (Sitelinks, Callouts, Asset Groups) — the free lever that moves Ad Rank without raising the bid for what an asset group actually contains.

What cannot be set below its owning level

- Budget — set at campaign level ("Your campaigns have their own budget") — support.google.com/google-ads/answer/1704396. - Network inclusion/exclusion (Search, Display) — campaign-level — support.google.com/google-ads/answer/1704395. - Location and language targeting — campaign-level, applying to every ad group inside — support.google.com/google-ads/answer/1704395. - Device targeting (desktop, tablet, mobile) — campaign-level — support.google.com/google-ads/answer/1704395. - Bidding strategy — set at campaign level, though individual bids can be overridden lower down — support.google.com/google-ads/answer/2375408.

Manual CPC specifically

the strategy is chosen at campaign level, but you specify a default bid per ad group (the "ad group default bid"), and an individual keyword bid overrides that ad group default — support.google.com/google-ads/answer/2390250. This is the one place bidding genuinely cascades: campaign strategy → ad group default → keyword override.

Ad groups themselves center on theme and bids: "pick a narrow theme and create ad groups around that theme. For each ad group, use keywords related to that theme" — support.google.com/google-ads/answer/6372655.

Organizing principles: what to split, what to consolidate

- By product/service line — split into separate campaigns when you need different budgets or settings per category (example given: separate campaigns for shirts vs. pants so each gets its own budget) — support.google.com/google-ads/answer/6372655. - By geography — split when location targeting must differ between business units, since location targeting is campaign-level — support.google.com/google-ads/answer/1704395. - By funnel stage — implied by full-funnel strategy guidance: combine awareness/reach campaigns, consideration campaigns, and action/conversion campaigns as distinct units — support.google.com/google-ads/answer/1704396. - Website structure as a starting template — organize ad groups so each represents a different page or category on the site — support.google.com/google-ads/answer/6372655. - By match type — do NOT split. Google's current framework ("The ABCs of Account Structure") recommends the opposite of the old best practice: consolidate all match types of a themed keyword set into one ad group, then simplify toward broad match, because "broad match leverages all available signals for intent matching, while duplicating keywords across match types fragments the data Smart Bidding uses" — support.google.com/google-ads/answer/14752782. See Keyword Match Types in 2026: Broad, Phrase, Exact — and Why None of Them Is Literal Anymore for what broad match actually does today, and Bidding Strategies: Manual, Smart Bidding, and When Each Applies — matching the strategy to the conversion data you actually have for the data prerequisites this consolidation is meant to protect.

Shared budgets

a single average daily budget shared by multiple campaigns, letting underutilized budget "automatically reallocate to budget-capped campaigns" — support.google.com/google-ads/answer/10487241. Google's own stat here is not about shared budgets in isolation: "customers that adopt Shared Budgets and Portfolio Bid Strategies on Search campaigns typically experience +13% more conversions" — the reported +13% requires pairing shared budgets with portfolio bid strategies, not shared budgets alone — support.google.com/google-ads/answer/10487241.

When shared budgets don't apply

available on Search, Shopping, Display, and Video campaigns; incompatible with experiments, Performance Max, Smart Shopping campaigns, and campaigns already using total budgets — support.google.com/google-ads/answer/10487241.

Negative keyword lists

a list of negative keywords excludes ads from serving for irrelevant terms, and one list can be applied to multiple campaigns — via the Exclusion Lists library, by multi-selecting campaigns on the Campaigns page, or per individual campaign — support.google.com/google-ads/answer/7449003. Limit: up to 20 negative keyword lists per account, up to 5,000 negative keywords per list — support.google.com/google-ads/answer/7449003. In manager accounts, account-level shared negative keyword lists (via the Shared library) can apply down to client accounts — support.google.com/google-ads/answer/7519927. See How to Do Keyword Research and Build a Negative Keyword List — closing the leak Smart Bidding can't see for how to build these lists.

What does NOT work: fragmenting the structure

Google's own current guidance explicitly reverses older "split everything" advice:

- Splitting by match type into separate ad groups — discouraged; consolidate into one themed ad group and lean on broad match instead, because duplicate keywords across match types fragment the signal Smart Bidding relies on — support.google.com/google-ads/answer/14752782. - Single-keyword ad groups (SKAGs) — Google recommends moving these into themed ad groups rather than keeping one keyword per ad group, again to help Smart Bidding optimize more effectively — support.google.com/google-ads/answer/14752782.

Both point at the same failure mode: more granular structure feels like more control, but it thins out the conversion data each ad group/keyword accumulates, which is the opposite of what automated bidding needs. See What Does NOT Work: Broad Match and Smart Bidding Without Guardrails — where automation burns budget instead of saving it for what happens when this fragmentation is paired with broad match and insufficient conversion volume.

Quality Score is keyword-level only

"There is no such thing as ad group-level, campaign-level or account-level Quality Score. Quality Score is measured on a scale from 1-10 and available at the keyword level" — support.google.com/google-ads/answer/6167118. See Quality Score — the diagnostic you audit, not the number you bid for for its three components.

Restructuring alone does not change it

"Breaking keywords into new ad groups or campaigns (without changing the ad text or landing page) has no effect on their quality" — support.google.com/google-ads/answer/6167118. It only moves indirectly — "moving a keyword to a new ad group that has new ad text could change your ad quality estimations (and therefore your Quality Score), because that can affect user experience" — support.google.com/google-ads/answer/6167118. In other words: reshuffling ad groups is not itself a Quality Score lever; new ad copy tied to a narrower theme is.

Reporting granularity

three native levels — account (all campaigns aggregated), campaign, and ad group — support.google.com/google-ads/answer/2404036. Deeper cuts are available via customizable statistics tables and multi-dimensional/multi-segment analysis at any of those levels — support.google.com/google-ads/answer/2404036. Asset-level reporting for Responsive Search Ads and asset groups adds channel, campaign, ad, and multi-campaign views on top — support.google.com/google-ads/answer/9781208.

Related

- Google Ads Campaign Types: What Each One Is For — Picking the Right Inventory Before You Set Up or Audit an Account — the Performance Max exception to this hierarchy (asset groups instead of ad groups) only makes sense once you know what PMax automates across. - Keyword Match Types in 2026: Broad, Phrase, Exact — and Why None of Them Is Literal Anymore — the match-type consolidation this page recommends only works if you understand what broad match actually matches on now. - Bidding Strategies: Manual, Smart Bidding, and When Each Applies — matching the strategy to the conversion data you actually have — the reason Google now tells you to consolidate rather than fragment: Smart Bidding needs concentrated conversion data per ad group, not scattered SKAGs. - How to Structure a Search Campaign (Ad Groups, RSAs, Settings) — the foundation an audit checks and a budget plan assumes is sound — turns this concept page's hierarchy and consolidation rules into the actual build steps for a Search campaign. - How to Audit an Existing Google Ads Account (Priority Order) — the sequence that stops you from trusting broken data — checking account structure and settings (budgets, bid strategies, stray network opt-ins) is step 2 of that audit, right after conversion tracking. - What Does NOT Work: Broad Match and Smart Bidding Without Guardrails — where automation burns budget instead of saving it — what goes wrong when consolidated, broad-match-heavy structure is launched without enough conversion volume to feed Smart Bidding.

This page exists for the wiki's objective because structure is the first thing a marketer or an AI agent touches when setting up or auditing an account: get the level-bound settings wrong (e.g., trying to set location targeting per ad group) and the account won't do what's intended; get the granularity wrong (SKAGs, per-match-type ad groups) and Smart Bidding is starved of data before it ever runs an auction.