Quoted By:
so you can use negative numbers for the morphs, and in pmxeditor, in the transform view you can store momentarily the morphed vertex via the "add archive the shape of the current" option from the file tab, and then import it in the window for morph creation via "selection from the archive" in the archive management of the edit tab and select the latest edit.
mixing negative numbers and positive numbers, it's possible to make more morphs this way, and then save them as a vertex morph instead of a group one, the same for the bone morphs
pretty nice.