HERE’S one of those little tricks that saves time and effort and makes life a bit easier. Hat tip to David Thorp of Excelysis:
How it works on the Mac: Select the custom function(s) at the bottom you want to move. Then scroll up and command-click to ALSO select the one immediately above where you want it/them to be moved to, and then move that one up (or down) one spot. The one(s) at the bottom will move up with it instantly. Then move them both/all back down one spot and they’re both/all where you want them.
This trick works with more than just Custom Functions – read it all.