I'll try to explain the best I can what I need.  We're running SW 2014.  On our drawings, the customer wants us to print the drawings with the Drawing No = 'X'+Partnumber until design is approved.  Once it is approved they want the official drawing package with the Drawing No on the drawings = just the Partnumber, to remove the 'X' in front of the partnumber.  I am trying to figure out a way to do this mod via some type of batch mode for the hundreds of drawings.

I can think of two ways to do this.  I can have two sheet formats (4 actually, because sheets 2,3 ... will have a different sheet format).  On my sheet format, on the Drawing No block I can have "X" {} Partnumber, for the drawings that need the X.  Then when I want the X removed, I can just reload a different sheet format without the X.  However, I don't know how to batch process this, and multi sheet drawings might complicate this.

The other choice is to make a Custom Property called, say, DrawingNo, that I can make the same as part number or X+Partnumber.  Again, I wouldn't know how to automate removing that X when the time comes.  I know with the Task Scheduler I can bulk change a property to a fixed value for all, but I don't know how to MODIFY a property with task scheduler.

I hope I'm making sense.  Is there a way to do this without writing macros? 

Thanks!