An easy way to manage your contacts and their phone numbers is by creating groups within the CONTACTS tab in your Text-Em-All account.
This gif below shows you how to create a new group in your CONTACTS:
This gif below shows you how to edit a group in your CONTACTS. There are two ways to edit a group. You can click on the 3 dots when hovering over the group name on the left hand side and click Edit. You can also click on the pencil icon in the upper right side when your group is selected to edit the group.
This gif below shows you the two ways 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 section. You can click the 3 dots when hovering over the group name on the left hand side and click Delete. You can also click on the Trashcan icon in the upper right hand corner when your in the group.