Then I decided I wanted to give one of them to someone as a gift. So is there
a hack in Brickstore to adjust the quantities down by 20%, or should I just upload
5 and then upload another one at -1?
Copy all the items you need to subtract to a new file, divide by 5, multiply
by -1, then copy/paste (merge all) with your other document set to existing lot
and ignore all.