Problem with shopping cart

I agreed with a client who has a restaurant with a variety of categories and products
The forms in which I fell is that the shopping cart does not work by grouping orders so that the user can choose different products and put them in one basket
I don’t know how to do that, is there any help?

@amino not sure what you mean by grouping orders. Can you elaborate in detail please?

I want to make an application for one restaurant and this restaurant has different taste categories and different foods
The thing that I wanted to do but could not is to make the user roam the application and add what he wants from the foods he wants done when he is finished he goes to the basket to order the food he chose in one order