Best way to combine projects in GrabCAD Print? Multiple users, one printer

Hi there, we've recently started up a new J55 prime and are new to GrabCAD print.

A team of 8 or so will be using the one printer, all generating files and trays to send to the printer. To save time & minimize bottlenecks, we need to combine multiple projects on each tray.

Currently, it looks like the only way is for each person to arrange their files on a 'child' tray/project. Then the person starting the print must open up each 'child' tray/project, select-all and copy, then open up the 'parent' tray/project and paste. Save & close, open up another 'child' tray and repeat.

Is there a better way? Being able to have multiple projects open or even multiple instances of GrabCAD Print would help, but doesn't seem possible. Is there something I'm missing?

Cheers