Create a new admin menu and additional booking prices

Hello, I have a website in which I need to do 2 tasks: 1) add additional prices to the booking block of "tours/activities". At the moment there is price 1 and price 2. I need to add Price 3, 4, 5, 6, 7, 8. 2) I need to duplicate all the functions of the admin menu "tours". We will call it "restaurants". All the added functionalities will have to be working with all the other linked functions on the website (cart page, options in the cart, email confirmation, etc...)