By the look of it, you seem to be working with radio buttons instead of check boxes. Radio buttons is a list of items which the user can only select 1 at a time. This is only technical question to start with, no intention to offense you.
To reset a form, you can always use the method xfa.host.resetData(); which will reset all fields to default value.
This method will also remove the user's new selection. To be able to reset only parts of the form you may want to add a subform's somExpression as parameter to reset only that part of the form. Let's say you want to reset multiple subforms at a time that does not contain the 4 main checkboxes you could use the following: