Your microflow to check the value selected for an enumeration in one form can be triggered by a customized save button. You can deal with the selected values for the enumeration in the form and commit them. Then you can handle the logic in that microflow based on the selected values. Finish with opening the second updated form with the determined values at the end of your flow.
To help you more specific, I need some more information. What exactly does your microflow look like? Could you please elaborate on that?