If you wish to exclude customers from being subject to any automatic suspension or restriction activity due to non-payment, there are two ways to do this in Cumulus.
If you wish to exclude a single customer, search for the customer you want to omit from auto-suspension and open the customer record.
From the Customer Screen:

To exclude a group of customers from being subject to any Auto-restriction activity due to non payment, you can use the Account Groups for this purpose. By grouping customers into an Account group, then configuring the Account Group correctly, you can ensure any customer that is added to the Account Group will not be suspended or have services restricted for non-payment.
This will only work on account groups that distribution lists.
Navigate: Admin > Settings > Automated Suspension
Account groups that are excluded from the business rule set for auto-suspension will be listed in the table.
Remove an account group from the exclusions list at any time by clicking the Remove from exclusions list link.