Follow the steps given below to associate/disassociate a rule group to/from a compliance policy or multiple policies.
If you wish to add/remove multiple groups from a particular policy, you can do it directly from the Policies page under Compliance menu.
Click on 'Associate Devices' for the policy from/to which you want to remove/add the rule groups, then click 'Back' on the newly opened slide, select/deselect the rule groups and click on save.