i will be able to copy/paste in 1 project, at the moment i have to open a 2nd project for the Paste to appear.

IT NOT [:(]
I've just verify this and it appear in the second plan BUT the pasted items has gone in the plan from where are copy.
So, the current solutions:
1.Copy ...->...Paste special... in the same work file than Copy->Paste in desire file.
2. Copy->Paste items in desire file and work from there.
3. Take some needed information from second file (dimensions, angles etc.), put it in first file and then test it hire until You're satisfied.
Finally grouped and copy->paste in second file.
Sorry, I'm not meet You expectancy [:((]