Inventory Purchase and issuance for a resturant sort of business

In your situation I don’t think using “Inventory on Hand” is your best solution. You should just post your raw materials to a P&L Purchases Account. If you read right through this post there is a discussion.

Also, you wouldn’t use Sales Orders or Sales Invoices. If you are running a cash register or a cash tin - set up a Cash Account - Kitchen Float. At the end of each day do a Receive Money - Kitchen Sales. Then when an amount is transfer to your Bank Account - use Bank Transfer.

Come back if you require any further assistance or clarification.