Connect vendor refund to specific customer job

The first question is whether you must record the refund in vendor payable accounts. Say you already paid $1,000 to a Vendor. Now you find you only owed $900 and you have $100 being returned. If it comes in so quickly you can offset your extra payment check it is easy. If not,the QuickBooks in-program help saya: Examples of deposits that are not customer payments include:Refunds, rebates, or reward checks from vendors. To do this task: Go to the Banking menu and click Make Deposits. In the Make Deposits window, select the account you'd like to deposit into. Click anywhere below the last payment in the list to add an entry. If you are entering a refund from a vendor, enter the vendor name. If this refund is for the return of items entered on a bill credit, enter the Accounts Payable account in the From Account column. If the refund is for a discount or overpayment, enter the expense account of the original expense in this column.

Of course, none of this relates to Job Cost. To cover that that you simply make a journal entry. It  takes the above expense expense and credits the Job Cost for the Customer. I cannot get this to match a particular Estimate line.
 

How do I post a refund on my debit card (cash account) from a vendor that I purchased with the same debit card AND purchased using the job-costing Items?