How to Split PO line Schedule after invoice matching

Business Send PO to supplier, supplier send invoice -> Invoice is matched to PO. After 1 month , material is shipped to 3 different locations , hence customer wants to split 1 PO schedule into 3 PO schedules and then receive PO. but while splitting PO schedule system throws error.
Is there any way to split PO schedule after it is matched to AP invoice?
is it possible to create AP invoice without PO schedule? so that once PO schedule split happens , we can update PO schedule on AP invoice?