Start each bill from Purchases → Bills (or Quick Create) so the document inherits the correct vendor payable context.
The header carries vendor, dates, currency, references, payment terms copied from vendor cards—fix one-off deviations per document without overwriting the master.
Line rows accept catalog items for consistent descriptions and GL hints, while one-off narration lines suit non-stock services when policy allows.
Tags like projects, branches, or custom dimensions propagate from lines into reports so spend stays attributable after payment.