Private Warehouse inventory website 2 -- 2

I am looking for someone who can help me develop my own webbased program for my company's warehouse, only for my own use so that I can get good order among my spare parts that I have for sale. The reason I want it to be web-based is because I want access to it on both my phone and computer. I want my own login, it should be a private page that only I should have access to. Since it will be very time consuming to add all products, I want to be sure that these can not disappear or be deleted, that they are stored on a web host or similar to prevent this. Delivery note is created with a final amount that I can give to the customer over the phone and then printed out and then manually entered into the invoice that I send from another program. I want x number of main categories with x number of subcategories to then get to the products that are placed in the subcategories. when I add a new product, I want it to be done manually in the specific subcategory where the product should be located. when I press the selected product, I must be able to choose to add x number of this product to a printed bar list. It must be possible to press add product and it will then end up on a printable list where the name of the product, my article number and the manufacturer's article number are included. I want a simple variant that looks simple and stylish and without complicated extra functions. Feel free to write and ask if there is something you are wondering about or is unclear. Feel free to check out the attached picture for more info.