Hi @nmjvk
You need to create and argument in the process xaml and keep the argument type as out and save the workflow and now access the main xaml and click on the invoke and assign the myint argument to myint variable in the main xaml and then you can get the value from process xaml to main xaml. keep a message box in the main xaml as shown below and print the int value in the main xaml.
Click on okay and run the workflow.
Regards