Possilbe to add another criterion onto Approval Refinement Template?

Hi there. This is my first question posted here so I hope it makes sense.

We are using 9.2 Expenses with image 25. Our users have a special request to route all "Manual CorpCard" transactions for pre-pay audit.

At the moment on the Approval Refinement Template, there's no criterion for Payment Type. We wonder whether we could add this field to the template - we understand it'll be a customization. I'm reaching out to the community to see whether any of you have done similar customization for your organization. If yes, what are the efforts involved? Apparently, adding extra field is just the start. We have to get the AWE to reference to this newly added field as well.