An easy way to manage your contacts and their phone numbers is by creating groups within the CONTACTS tab in your Call-Em-All account.
This image below shows you how to create a new group in your CONTACTS:
This image below shows you how to edit a group in your CONTACTS. There are two ways to edit a group. You can click on the pencil icon next to the group name on the left side of the screen or on the pencil icon in the upper right side when your group is selected:
This image below shows you how to delete a group from within your contacts. Deleting a group will simply remove the group. The contacts that were once in the group will remain in your "Everyone" group as well as if they are included in any other groups in your contacts.