1. Go to Job Cost, Tasks, and Enter Billings...
2. Enter the same Job, Draw, and Invoice as the original entry.
3. To void the billing:
   1. Enter the opposite amounts, Amount Billed and Retainage, as the original invoice.
   2. In the Bill Ret? column, confirm that it shows the same option as the original (H or B).
   3. Confirm the accounts are the same as the original invoice.
   4. Save Line and Finish.
4. To adjust the billing:
   1. Enter the adjustment amount in Amount Billed and/or Retainage.
   2. Save Line and Finish.

How do I work with Billings and Deposits in JC?

How do I enter invoices or billings in Job Cost (when Accounts Receivables isn't installed)?