Bucket A contains items and current located in bucket P1.

Move all items from bucket A to bucket p2.

Move the empty bucket A to p2

Copy all bucket A items from bucket p2 to bucket A

Select bucket A from the bucket dashboard

Change the parent bucket field from P1 to P2

Select bucket p2 in the move function as a target for bucket A

Execute the move function

Create a new bucket in bucket P2

Move all items from bucket A to the new bucket

Delete bucket A and rename the new bucket