I do not believe that is what I mean. Let me illustrate with an example I am thinking of, recently.
In setting up Source Templates for items such as Interviews I have conducted or Letters I have Received, the form contains name fields for the Interviewer or the Recipient. If I create Sources for each interview and letter I find myself entering my Name and Address info over and over again for each one. If I have a different address in the future I must edit each record. I could hard code the text for my Name and Address in each Source Template, requiring me to only edit the Templates to update the Address. However, if I could reference the Preparer Info about myself, i.e., [Preparer] and [Preparer:City], [Preparer:State], then I would only have to change the Address in one place, the Preparer Record, and it would permeate throughout all the Source Citations.