A company may purchase items or accrue expenses without indicating a customer: job on the bill or check. The company may later decide that they want to allocate these expenses with a customer: job(s).
To resolve this issue, you can bring up any transaction that you wish to associate with a customer: job and select the customer: job on that transaction. However, if you do not wish to change each individual transaction, you can use this solution: creating a clearing account, creating a clearing vendor and creating a zero dollar check.
Create a Clearing Account.
You can use a zero dollar Bill or Credit Card Charge. In each case, the transaction will record $0.00 to the source account. You can use a Journal Entry, but you cannot see the transaction on Item based reports.
Note: Do not enter a Customer:job on this line.
You will now have an expense associated the indicated customer job, without duplicating the expense to the company. Look over job costing reports to make sure numbers are correct.