Invoice from selected Order rows
Bill some rows of an Order now and leave the rest open for a later invoice. The standard progress-billing pattern — bill what's been delivered, keep the remainder on the open Order.
Each Order item carries its own snapshot of rate and on-costs; invoices spawned from selected rows pick up only those rows' snapshots. The Order itself stays Open until every row has been invoiced (or you mark it Completed manually).
You can spawn as many partial invoices off one Order as the project needs. Each invoice gets its own number and its own journal; the row-to-invoice link is kept so you can always trace which invoice billed which Order row.
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