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Selecting polygroups and making them a subtool...?

ZBrush Usage Questions
#1

I have a mesh that is already grouped, the problem is there are way too many groupings…if I press group split in the sub tools menu I get a bizillion little parts.

How do I seperate numerous groups and make those into a seperate sub tool?

Example:
I bring onto the stage a figure already grouped. I select certain parts of that figure (both legs, which would be about 4 seperate groups) and make those groups into a new sub tool…so I would have a sub tool for the legs and a sub tool for the rest of the figure. I’m having trouble only have one set of legs as a seperate sub tool. All I’m getting right now is numerous duplicate whole bodies as sub tools…not just the parts/groups I want.

Hope this makes sense what I’m asking.
Thanks

#2

You need to make separate groups of what you want to see as a subtool. For instance if you want the leg to be a subtool . then hide the other objects in the scene and hit group visible in polygroup, then try the grpsplit.