You can unmerge any trips at anytime. Please note that if you unmerge the trip, all the trips in that trip card will be unmerged.
Step 1: Find the trip you would like to unmerge and click on the trip card. The link icon will indicate the trip cards that have been merged.
Step 2: The unmerge icon is located at the top of the screen (broken link icon).
Step 3: Confirm that you would like to unmerge your trips and you are all done!