Hi @Gretchen_Hooker
as far as i know, there is no option to “merge” them, but there are some other options if your goal is to display priority, which been named differently as you mentioned.
for Example: creating a portfolio and adding all projects you need to it, then in the list view you can add all projects fields you want to show. .
option two: Changing the field globally to be unified in all projects. There is a thread here about this