On Vendor master data create same function as already exists on customer master data on the tab sales order defaults --> Section Groups--> Automatic cancel (under supplementary item group).

When this boolean is set to true, when supplementary items are added to the sales order using calculate supplementary items, this would automatically also remove these supplementary items, when the original item (for which supplementary items are setup) is removed from the sales order.

So also create this parameter on vendor master data on the tab purchase order defauts -->Section Supplementary item-->Under under supplementary item group, with same function as described above.