Replacing Y/N Flag with Checkbox

Hi
I am trying to replace the Y/N flag for Report-Only Mode in a program to a checkbox.
My question is how do I pass the Y/N back to the Report Only Mode value based on checkbox?
So that I don't build a custom  AGS call when I click on inquire and the program can pick it up based on the updated values from the screen itself.

i.e it should map the checked/unchecked in custom  checkbox back to the screen?

I was able to map the Y/N values from screen to checkbox checked or unchecked. How do I update it back so that it doesn't still use the previous values when I check/uncheck the checkbox and I click on inquire or change?