Just group it in an external modeler. Or in zbrush, though it's been a few years since I've used zbrush. For grouping I use Wings3D. Very nuts and bolts modeler, you'd probably want to go with blender but all the other bells and whistles of blender tend to make things confusing. Although no doubt zbrush is very capable usually you'd want to do grouping and poly by poly selection type stuff in a polygonal modeler rather than a sculpting app, otherwise you wouldn't be asking for an easier way. Just my 2 cents, not to be misunderstood as being obtrusive. As far as I can tell with most of this stuff, even the most automated easy way is still pretty labor intensive, just the nature of this kind of content creation.

W10 Pro, HP Envy X360 Laptop, Intel Core i7-10510U, NVIDIA GeForce MX250, Intel UHD, 16 GB DDR4-2400 SDRAM, 1 TB PCIe NVMe M.2 SSD

Mudbox 2022, Adobe PS CC, Poser Pro 11.3, Blender 2.9, Wings3D 2.2.5

Forum: Poser 11 / Poser Pro 11 OFFICIAL Technical

Subject: How do I create surface / material groups in Poser