Regarding sales invoices, you can create them as you normally would for other items. Is there a specific issue you're encountering with this process?
As for sending raw materials to the quality department, it depends on the timing. Is this occurring when you purchase and receive the raw materials, or is it a step in the manufacturing process? If it's upon purchase, Business Central doesn't have a built-in quality control module.
Typically, you would receive the items into a designated QC bin and hold them there until inspection. After approval, they can be moved to the appropriate bin. Additionally, there are third-party add-ons available for quality control that you might consider.
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