Yes, when choosing the product you will be able to choose the type of base and the quantity, as well as whether you want accessories such as a case and in what quantity.
For example, if you want 6 x Fly Banner Complete Pack Gota S, 3 of them with crosshead base and 3 with car base, you will have to:
Select the desired product, size and quantity
In the step to choose the base, check the option "I want to choose different types of bases". There you will have to choose the bases and quantities
It's the same with the cases. You can select how many you want.