I group in a modeler. Wings3d, it's a little complicated to explain because I manually re-edit g and usemtl lines in the .obj file to arrive at my final grouped mesh. Whatever you do, do not attempt grouping your mesh in Poser. A workaround to Poser's crappy grouping polygon selections is to assign all of your proposed body part groups as material regions in a modeler, thus not splitting the mesh, opening the .obj in a text editor and changing the line usemtl to g. You'll then have a solid mesh with groups. You'll have to set up materials after the fact. There's many ways of doing this. There's no one decisive workflow, and there's a lot more to figure creation than just grouping and rigging. Not to discourage you but if you are new to Poser and not familiar with .cr2 internals, erc, joint parameters, weight mapping, etc. you have a long road ahead of you... especially for a figure such as you propose.

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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

My Freestuff and Gallery at ShareCG