You can combine flower groupings into one model by file:export: wavefront object (all options unchecked), file:import: wavefront object (all options unchecked). The model will load as one object, one group, one center of rotation, material groups and UVs maintained (generally; the usemtl lines may be appended by numeric tags such as 1:, :2, etc. depending on duplicate instances of the model. This is done by Poser on export and is easy to fix by opening the resulting .obj file in a text editor, searching :1 etc. and replacing with a blank space. Usually this is a non-issue, in particular for your purposes). Before creation of your customized .obj you may want to save a material collection (.mc6) to apply to your new object as a labor saving step, you can then resave your new prop to the library. Don't fret over the embedded geometry (I won't bother explaining that, It's a distribution thing, not relevant to your query).

Perhaps this might sound overly complex, but really it's not. It's how the models were assembled in the first place, you will simply be customizing them to suit your own needs and preferences. I do it all the time.

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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