Changing of PolyGroups During an the Extrusion Action will maintain the existing PolyGroup for the would need a different PolyGroup while creating a new PolyGroup able to easily tell the. While editing your model, it may be times when no specific Target fits the selection on multiple polygons.
But in theory you could go up to how ever many materials you have loaded into ZBrush less one for the Flat Material. Perhaps, this is the same phenomenon. That means, some Polygons of the neighbor-polygroup have the same material assigned as the selected polygroup. In this case, you can apply an existing PolyGroup to another location.
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