Learning Altium - Multiple Schematic Sheets

[Poe]

I'm designing a two PCB device where the PCBs are soldered together with board to board header.  I have one PCB file for both boards, but a unique schematic sheet for each PCB. 

I use unique net labels so the ERC does not claim I have an unrouted net between the two boards. 

e.g.
"3.3V.a" vs "3.3V.b"
"MISO.a" vs "MISO.b"

It's messy and there's probably a simpler/cleaner way?

[Jeroen3]

Whats blocking you from creating two pcb projects?

[Poe]

Whats blocking you from creating two pcb projects?

I would like only one set of gerbers.  Is there an easy way to do that with two PCB projects?