I was hoping to avoid those steps. Since I am familiar with Blender, it seems easier for me to import the FBX into Blender and then transfer the skin weights to the clothes, and manually remove the hidden faces under the clothes. Then export out to Unity.

Thank you for the answer and knowing that was possible in Poser 11 was removed becaue it did not work very well.

Also this way I can make changes if needed to make the clothes fit perfectly. And of course reduce the polys in the hair.

Much hair sold in this store is unusable because of the high polycount, and if you poly reduce it it starts to look bad. A lot of the free hair from a decade ago is easier to work with. Also I noticed that I have 4 levels LOD for Victoria in the DAZ geometry folder in my runtime. I don't know how many people know this. It goes from 65K to 17k to 4k to 2k to 1k. The last three  won't accept morphs. Not that Poser users would need to use any of them, unless you need some background people. There are none for Michael4.