How to manage forms and variable

Hello,

in my IW application each form has its own logic (procedure) to navigate to other forms based on user interaction.
Among other features the app manage an order entry procedure and many forms share the order infos.

I would like to manage the navigation between forms and the variable they share in a better and centralized way.
Is there some samples about how to control the app navigation in one "controller" class?

Is creating the copy of one object on the form to show a good practice to pass variables between forms (something like REACT immutable object) ?

Thank you,
Davide