I am following this reallusion tutorial :

youtube.com/watch?v=AAT0m-BAPvo

I am trying to bring in some Daz clothing assets called the Divide. 

This particular outfit has backpack that has a lot of attachments to it, as well as a belt and a belt buckle that load separately into Daz. I want to save them in CC3 and my question is this. How can I merge the backpack and the attachments together so when  I save it is all saved together and when I load it on a CC3+ character it all loads as one piece. Obviously same concept for the belt. or ideally merge the belt on to the pants.