Within the details page of your each creative you may add tracking parameters in the “Tracking” field. This will need to be done for each creative where you would like to add/edit creative level tracking parameters.
Just place one of the macros into the tracking section of a campaign creative / content URL [ex. utm_campaign=$cid]
$sid (Site ID) — Identifies site from which this visitor originated.
$cid (Campaign ID) — Identifies the campaign from which this content is served.
$coid (Ad Creative ID) — Identifies the specific ad creative in a campaign that was clicked.