Make it,cost it
Bills of materials and production orders that use up components and add finished goods at their real cost.

What goes into each product.
A bill of materials lists the components for a batch and the labour and overheads it takes. Production orders load the components from it, scaled to the quantity you are making.
Stock and cost, both right.
Producing takes the components out of stock at their average cost and brings the finished goods in at the total, labour included, so the margin on each sale is real. As with a sale, a component cannot go below zero stock unless you allow negative stock.
More in OSuite
Invoicing and quotations
Tax invoices, quotations, proformas and credit notes, with GST worked out as you type.

GST returns
GSTR-1 and GSTR-3B from your posted documents, GSTR-2B matched to your bills, and the GSTR-9 summary.

E-invoicing and e-way bills
E-invoice JSON in the IRP format, checked first; IRN and signed QR on the print; e-way bills from the IRN.
