StudioBinder not only automatically sorts your Contact's by Talent, Client, Crew, and Extra, it also allows you to make your own custom Contact List. You can follow these steps in Project Contact or All Contacts.
Step 1 — Click on Add New List
On the Project Contacts or All Contacts page, click Add New List, enter a name, and click the Create button. You can rename and delete this List at any point.
Step 2 — Select your Contacts
Tick the checkboxes next to your selected Contacts and click the Add to List button.
Step 3 — Add your Contact to a List
Search for your newly created Project List, click on the + next to the List, and click Add to List.