Record a bill

Vendor invoices with as many lines as they need.

1. Bills → New bill. Pick or add the vendor, the dates, and the lines — each with quantity, price, tax rate and an expense category.
2. Every category is either COGS (direct job cost) or OpEx (overhead). That split is what makes gross profit meaningful; change a category's type under Vendors and reports update.
3. Mark paid when it is, or let Banking match the payment to it.