Right now, I can use \$PRP:"SW-Current Sheet" and \$PRP:"SW-Total Sheets" to show the number of sheets on a drawing. What I want, is to be able to attach a change notice inside the solidworks drawing. This will mean that the page numbering will always be off, because these additional sheets are not drawing sheets but the change notice.

Does anyone know of a way to modify SW-Total Sheets to make it conditionally less than the actual total?

I know there is a way, with part/assembly files to do this type of thing, but I'm not sure how to implement this with my drawings. Here is a link to a discussion about doing math in custom properties: https://forum.solidworks.com/thread/22508

To make it more complicated, not all drawings will have page numbers that are off, some will still be correct.

I would be very excited to hear if someone has already found a solution, before I dig deeper.