Step 1 - Find the Lead you wish to add a related contact to.
Step 2 - Click the lead to open it and go to the Contact tab
Step 3 - Click the Add Related Contact button at the top right of the Contact Information section
Step 4 - Fill out the information about the related contact in the Add Related Contact form. Click the "Choose Existing Contact" button if the related contact is already in your system.
Note: Remember to click "Yes" under Additional Plaintiff if the contact is an additional plaintiff
Step 5 - Click Save Changes to save the related contact