I own a restaurant biz, i buy cups, bento box, where do i code this? office supplies?

Answer 1

I would not recommend that these be coded as office supplies.
This is an operating expense that should be controlled separately. It will vary as your business may fluctuate. You will definitely want to know, at times, what percentage these are of your food sales. If you do not charge extra for carry out sales, you may find that becomes necessary if these supplies exceed a fixed/reasonable amount, either because of price increases and/or shortages.

Office supplies also need to be controlled, especially for shortage and waste.

Answer 2

You can always check with your CPA. If these are things that are later sold to customers then they are Cost of Goods Sold.