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Help: creating separate robot parts

Hello, I am fairly new to zbrush but I am getting the hang of it.

I am trying to create a toy robot that can be printed. the Robot has lots of moving parts so I thought it best to create each assembly (I.E. arms, legs, body) is separate ztools. the question is; now that the leg and arm assemblies are done, how to I combine the separate ztools into a single tool?

more info:
i have tools for the arms legs and body. Each one of these tools has subtools that are joints and the like. I want to combine the entirety of the tool including subtools as is.
thank you very much for any help or tips.

Make sure other ztools are visible then start with your main tool ( body for instance ). In the subtool palette theres a button called insert. Press it and find the body part you want to combine with your main ztool. This should insert the ztool into your main tool with all its subtools. Repeat this for all other ztools. Hope this helps!

I ended up using the subtool master to combine the tools. Thanks for the help