• Set Billing ID.  You can enter any number or string in this box you want and it will be applied to the Billing ID value for each subscriber you selected.  This value is only used for reporting purposes (it shows up in a couple of the Unity reports).
• Force Billing ID to be blank.  If you select this option, the edit box for the Billing ID will be set to blank and BulkEdit will force a blank string into the billing ID property for each user selected.
• Unlock Account. If you check this box, all subscribers will have their accounts unlocked.  If users have locked themselves out after too many failed attempts to log in over the phone this may be a quick mechanism to unlock them all at once.  If you leave this field blank it will not be touched… there’s no way to delete billing IDs for all subscribers.