AutoFit will convert clothing from the previous generation to the current without any add-ons - so V4/M4 to Genesis, Genesis to Genesis 2 Female or Male, Genesis 2 Female/Male to Genesis 3 Female/Male. It's also possible to use the Transfer Utility to convert morphs. There are add-ons to use AutoFit to skip generations, and there's GenX 2 for a smoother morph conversion. Textures can be used on the next geenration up to Genesis 2, Genesis 3 does require add-ons to use older textures (as does skipping two or more generations).