You can deactivate sponsor and all it's galleries will be removed from site pages. Note, if you deactivate sponsor - galleries will NOT be deleted, if you delete sponsor - galleries will be deleted too.
Basicly you can output any sponsor field at sponsor's page and rule id simple - <!–SPONSOR_FIELDNAME–> for example, <!–SPONSOR_BANNER1–>, take a look at list of tags in Temaplates.