Changing reference designators without re-placing components

Hi,

I have a board file and schematic that are linked. There are 5 different schematics and layouts (already manufacturered) each are independant of each other but are on the same board with v-grooves cut between them. I want to create a new schematic and board each of which are individual instead of together on one board. This would not be a problem but I would like to be able to change the reference designators on the schematic without re-placing the components on the board file after I import the netlist. 

Is this possible?

Thanks