Any Costs that should no longer be in use, but have historical campaigns tied to them, can be deactivated. Deactivating a Cost will restrict it from being offered as an option for future campaigns.
To Deactivate A Cost
You must be an Administrator to deactivate Costs
Click on your company name in the upper right corner of Bionic.
Click on the Administration option
Click on the Costs Columns tab
Use the check boxes to select the Costs you want to deactivate
Press the Deactivate button