Creating a TEXT field to store Group Assignments on the Contact record

1. Navigate to Setup and select the Object Manager.
2. Select the Contact object, and then the Custom Fields & Relationships section, select New.
3. Select a Data Type of Text.
4. Select Next.
5. Enter a Field Label [Group Assignment], Length [80], and Field Name [Group Assignment]. 
6. Select Next.
7. For each Profile listed, indicate the Field Level Security. 
8. Select Next.
9. Select any Page Layouts where the field should be added.
10. Select Save.

Note: Each additional object that you add to the Group Assignment Builder must have a Group Assignment field created on the object.

Back to How to Implement/Configure Group Assignments