Step 1 — Click on Add New List
On the Project 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.