I found this tutorial from SIGASIGA in Freestuff really helpful about understanding how to use the setup room.

Convert-clothing-lafemme-1-to-la-femme-2 

Prefitter has a V4 to Genesis3 converter in Freestuff, but I don't know if you can use Prefitter in reverse. I've never really used Prefitter before, because I never really used the setup room before until I used SIGASIGA's tutorial.

I love XD4 and also wish there was G3 to V4 conversion.

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W11,Intel i9-14900KF @ 3.20GHz, 64.0 GB RAM, 64-bit, GeForce GTX 4070 Ti SUPER, 16GB. 

Old lady hobbyist.

All visual art or fiction is "playing with dolls."