You want to use Order Tags (product modifiers). You can create an Order Tag group and assign it to your whole Soup menu category. Read more about the various options here:
For your specific case, I have done something recently myself for an Indian restaurant. You can see when select a product, there is options for spice level.
^Thank you very much for your quick reply. For the soup I´ve done it and its working great !!.
For the drinks I am more into different like Beer: When I press the Beer Button (at Beverages) it will appear brand large or small. like one sub menu of beer.
Thank you so much and I wish you all happy new year
If you just add portions to a product, when you press the menu item button, the first portion will be added by default. If you want to make the portions screen appear each time you press the item button, you need to turn on Auto Select for that item in Products > Menu List > (select menu) > (select category) > Edit Product Properties.