Is it possible to make data changes to an invoice without having to specify what the invoice is? For example, when I make a change to a field, that change is made to any invoice. Can you understand? It's just a question

sounds like a mass update script or workflow?

worflow

Workflows run on an instance of a record so you don't need to know the exact Invoice. Your question doesn't make sense otherwise. You may need to rephrase it.

Thanks @creece! I have to see more about the suitescript. I really didn't get it.