The 15.5 release will support design partitioning, but until then you have to manually manage this. To transfer the data from other designs into the master design, you can export, then import clip files (sub-drawings) in Allegro PCB Editor. Originally posted in cdnusers.org by Padmin
If you are using the Allegro PCB Router (SPECCTRA), SourceLink Solution 11099366 will be helpful. I'll warn you now though, the illustrations needs to be improved, but you should be able to follow the detailed steps. I hope this helps!