Have you tried the "Undock" command from the Flle menu in Expedition? That should enable you to 'disconnect' the PCB from the schematic, send it out and continue working on the schematic. You would then have to get the PCB database back, re-dock it and forward-anno.
Have you tried that?
No we didn't try that. In the end we zipped up the entire project (iCDB + PCB) and sent it to the sub-con, and then they sent it back (234Mb!). We'll have a few more of these forward/backward steps, and that was what I was hoping to avoid. What I wanted was to be able to just send the forward/back annotate files, that should in theory be much smaller. As it is, the transfer from one site to the other with this size file takes us a few hours.
I was hoping that maybe someone here uses this functionality, or that the usual Mentor people on here know about it.
The "undock" feature does look interesting though for some other use cases, and I suppose would allow some concurrent schematic editing while the PCB file is offsite.