Purchase Order - Order Number

Purchase Order - Order Number

I would like a place to store the Order Number,  We could do this as a UDF, but there maybe multiple order numbers per purchase order, and would be good to track that through.   Then when the Invoice comes in, we should be able to tie that back to the order number (I have many vendors who invoice on each "order", so I get multiple invoices / order). 

Also when adding invoices, there should be an "Invoice Amount" again, as we can have multiple invoices/order.
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