thank you Adam!
Sorry I am a bit stupid, I got to the part to do workflow for open an external website, however maybe I am on a free plan testing out my development, i can’t link to the new page i created, and also on the new page i created i cant find the Get Data from URL 
I thought using a simpler example might be easier for me to explain my data, actually I am working on a Food Menu Point Of Sales app, and want to get the Menu Items work like McDonalds Points Of Sales system, tapping on Cheese Burger and I can choose Double Cheese Burger etc, that’s why I use Option Sets for my Main Category, and Option Sets for my Sub Category, and Data Type for my Dishes items (not sure is it the right way but so far I am able to input my data well)
so far what I have is:
Option Set 1
Menu
Display (text)
these gives my main category of my menu selections such as Drinks, Burger, Steaks, Pizza etc
Option Set 2
Drinks
Display
Main Category (Menu)
these gives my subcategory from the main category such as Coffee, Shakes, Lemonades when I click on Drinks
Data Type
Item
name (text)
price (number)
Main Category (Menu)
Sub Category (Drinks)
this data type allow me to choose the Order, for example:
Black Coffee
3.59
Drinks
Coffee
and I will have another Data Type naming Order to take List of Items for my Orders
so I was thinking Repeating Group to show Option Set 1, the Main Category; for example I tap on Drinks; then I will redirect to a new page to show Repeating Group of Option Set 2, the Sub Category, showing Coffee, Shakes, Lemonade; and lastly when I tap on Coffee, it redirects me to all the Items in Coffee, where I will able to see Black Coffee for me to tap on
I saw there is an option when I choose Workflow, Navigation, Go to Page; and Data to Send i can choose This Text, but then I don’t know what to do next; will this “This Text” option able to help me to identify which page to go to?
Thank you again!