We charge FIT to PARTIAL when we morph from preop on a crown to RPD case. When we did everything analog this fee was an additional $45 same for digital
If the case of nightguards we get it close and then dr adjusts with no warranty and no charge.
Most times when I show them how nasty the crown is going to look when we copy from I can convince them its not the best path.
I like that you are thinking about this, to many just roll it in as a value added service. I believe it takes more time so I charge for it.