I added a checkbox on the signup form. The users can select one or both options. Based on the selection, they will be added to separate lists. They are also added the a « master list » that is linked to the submission form.
So a user will be part of « masterlist » as well as « option1 » or « option2 » or both of these.
I want to have a list now with the users that are on masterlist and option1 for example. How do I do this?
I tried to add 2 lists in the section « Member of a list », but this pulls in users that do not belong there.