Probuilderizing skinned mesh?

Is this possible ? Apparently not but maybe I’m missing something? I created a character. Imported him to mixamo and exported him unity. I can productive almost anything which is amazing but not these meshes. Unless there is another way? I’m trying to avoid having to import to blender or any other software. Trying to do this within unity.
I just need to remove an appendage font the characters body.
I “remove” unwanted vertices from other models very easily with producible by “detaching face” and then deleting it.
But I cannot do this with a skinned mesh it seems.

Or am I missing something?

Probuilder is meant for prototyping environments, not for skinned meshes.
For something like that you really need a dedicated DCC to do it properly, especially due to the bones that will need to be deleted and the skinning fixed.