Delete Campaigns from Hierarchy
From the top-level campaign in the hierarchy, you can remove campaigns from the campaign hierarchy when necessary.
On the Hierarchy tab of a top-level campaign, select Edit campaign hierarchy. The Edit campaign hierarchy screen appears. Select a campaign to remove from the hierarchy and select Delete. Select Save to save your changes and return to the Hierarchy tab.
Tip: This process removes the campaign from the hierarchy, but does not delete the campaign record.