Reusable field between forms

Hi guys.

I have about 6 forms in my site, each one with different purposes, but all 6 have this same one field, that repeats it in all of them. The problem is that this field is a list of branches that people have to select the one that they are from. And its a long list, that changes frequently, so my problem is that right now I have to edit 6 forms each time the list changes.

So my question is: is there a way to feed this ‘dropdown select’ field in all 6 forms with all the options, but the list itself come from a unique source? Maybe a php code/file, or a specific form that has only this one select field and then this field gets replicated in the other 6 forms? Do you guys can point a way that this ‘one source list’ can be fed in the select fields of all 6 forms?

Thanks in advance.