Linking Ads to a Campaign
You can create and save a campaign without any linked ads. However, you must link at least one ad before it can go live. An ad can be linked to any number of campaigns, and a campaign can have multiple ads linked to it. You can link and unlink ads at any time once the campaign is saved, regardless of whether it is live or not.
Linking Ads from the My Ads Screen
From the My Ads screen, click the Actions button next to the ad that you want to link and select Link Campaigns.
In the Link to Campaigns window, click Add next to a campaign to link it to your ad. The campaign then appears in the Linked Campaigns list to the right. You can link multiple campaigns using this method.
Click the X next to a campaign to remove it from the Linked Campaigns list.
Click Save when finished.
Linking Ads in Bulk from the My Ads Screen
Select the check boxes next to the ads that you want to link. Then, click Link to Campaigns.
In the Link Ads to Campaigns window, click Add next to the campaigns that you want to link the ads to. You can link the ads to a single campaign or to multiple campaigns, but keep in mind that all selected ads will be linked.
To remove a campaign, click the X in the Linked Campaigns list.
After you add your campaigns, click Save. All linked campaigns will appear in the bottom half of the My Ads screen.