Joining 3rd party sessions

Hi folks

I plan to do a climbing session on a 3 party app which will consist of 3 different routes from the app done back to back. Is there a way of combining the 3 sessions in athletica so it assesses it as 1 session.

Perhaps don’t upload the individual files but save the fit files then join them together using something like then upload the resultant file.

Ok got a tip eleswhere to start record at the start of the 1st session with garmin watch and finish the session on the watch after last session on the app. I’ll see how goes.