I know this is a basic issue but for some reason, I can not get it to work properly for me. I have a list box that has options for Q1, Q2, Q3. I want users to select which option they wish to run(Q1 or Q2 or Q3) and based on the user's selections the variable will change to the selection in the formula tool.

So if user select Q1 all the variable will be Q1 in the formula tool
From the image i want the variable to be users selections.
