PO Auto-match for prepayment

We are creating multiple PO with about 200 PO lines. Now, when we are trying to match the prepayment to PO, we want to match specific lines only with 50% Quantity matching to PO. In this case, we are forced to match the PO lines manually and enter the quantity for every line.

We are looking for a solution like auto-matching rule where if we use 50% matching rule, system will automatically match PO lines 50% quantity to the prepayment. Please let us know if there is any such feasibility.