This is a very old post so not very likely to reply.
The solution says: “they are combined in to a multi-body part in DM (select parts, right click and choose form new part).”
DM stands for design modeler.
As this is an old post and useful perhaps to others we will close it. Feel free to open a new one if needed.
Scripting might be another possibe solution (an example is here: https://discuss.ansys.com/discussion/2698/centre-of-gravity-mechanical-script)
All the best
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