Don't print a purchase contract number on PO if it starts with "VQD"

Need a little help.  We are very new to NetSuite.

We are an electronics distributor and get cost books from our vendors that could have quantity discounts.  It's not a set percentage discount so can't use pricing schedules.  I am amazed that NetSuite hasn't added a way to do item quantity costs based on a price like they do with resale.  I'm also amazed that there is not a SuiteApp that somebody has written to do it.  I've found other complaints so I know I'm not the only one.  Anyway, I digress.

To get around this the company that did our implementation has us using purchase contracts and we name them VQD along with the vendor name and date of the price book.  We also get special contracts on items so add those in also using purchase contracts.  When we generate the printed PO, we need the special purchase contract number to print on the PO but not the price book one which starts with VQD.  I've got the template set up to currently print the contract number but was wondering if I could add a test and if the contract number