Construction and renovation work is billed in stages, not single sales — quotations, progress claims, delivery orders for materials, and final invoices. TxBilling follows that project-based flow instead of a retail checkout model.
You can issue an e-Invoice per progress claim/milestone as each payment becomes due — this is the more common and cleaner approach for larger projects, and matches how most contracts are structured.
Use a Delivery Order to record materials delivered, then include them as line items in your progress invoice, or bill them separately if your contract requires it.
Individual buyers without a TIN typically use a general/default TIN value as guided by LHDN's rules for such cases — check LHDN's current MyInvois guidance or your accountant for the correct treatment, since requirements can be updated.