"Quick Parts" is a poor term thought up by someone in marketing, I suspect. It refers to disparate features of Word that someone put under one menu.

"Building Blocks" is better but still very vague. It means something contained in a Building Blocks Gallery. AutoText was the first such tool and is still the only one available on Macs.

What I mean is that you will want a separate AutoText entry for each of these terms you want to be able to change. Then you use an AutoText field for that term in your other Building Blocks. When you change the AutoText entry, it will automatically change in your other building blocks.

You may have to unlink or lock your AutoText fields in your documents if they will be separated from the template that holds the building blocks. You can use a macro to do that. Write if you need the macro.