Hello,
I'm looking for advice regarding how to add a "convenience fee" for front end purchases of a CBsubs plan. This would be a set dollar amount (vs. % sales tax) added to each plan purchase before checkout.

Thank you for your response, this "negative amount" promotion did the trick. My last issue regarding this is how to have the fixed amount promotion apply only to front-end purchases but not apply to the same purchases completed in the back-end by office staff (just a reminder that I am trying to establish a fee for online/front-end transactions only). I have experimented with some of the "Conditions" of the Promotions/Conditions tab to try and exclude office staff from promotions but any of my conditions wind up excluding all users (front and back end) from being presented the promotion. Any suggestions you have would be appreciated.