Buddy Pass question ... change of departure city on return portion

Is it possible to use the pass, round trip, ATL to LHR and return CDG to ATL on a buddy pass?

I am sure there is a cost involved and that is fine, just do not want to miss flight and going home because it violates a rule.

Thanks

yes, that routing is called an "open jaw" and is legal on a Delta Buddy Pass...

make sure you have RT buddy pass because you can't ADD a new leg to return, only change city options--if it's only tkt'd as one way, you have to use another pass