When I edit that one movie to change the location it changes the location for the entire pack.
Of course, the location is the location of the entire pack. A pack being a box that contains several movies, all those movies are located where the box is located.
The problem is that when I "remove it from owned" (since there is no "remove from pack") it deletes all of the movies in the pack
Yes, clicking "remove from owned" will remove the entire pack. To remove only one movie, you must click the "-" button (minus button) that is on the right of the movie name. You'll have the choice to either extract the movie from the pack, or to remove it completely.
I am thinking of removing all of the pack names since I have had so much difficulty with them.
Now that I've told you how to extract a movie from a pack, do you still have some difficulty with packs ?