The way I manage this:
1) make a new card
2) copy all the checklists from the cards I want to merge (Add checklist and use "copy items from..." dropdown)
3) you can then freely drag & drop the checklist items from each checklist into the top one & then delete the empty ones
@M Chahal, Doesn't look like it's possible yet. See this recent discussion:
Hello Community! Quick disclaimer: We are running a contest on Community (The Atlympics!) from July 23rd - August 8th of 2021. If you are interested in participating in this contest (prizes! ...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events