It is nothing more than stocking, selling and storing, plus returning at most. If you want to do better, or there are more shops, you can download a software from Huajun or something, which is generally not free. You can try it. If you are a designer, you'd better ask the manufacturer to provide you with a set.

If there is no information technology, you can sort out a set of manual accounts by yourself and stick to it every day, ok.