To add a new contact under a supplier or contractor, navigate to Contacts > Suppliers or Contractors > select the relevant supplier or contractor > Contacts, and at the top right of the screen, click + Contact, as shown below.

You will need to enter the contact name, email, mobile number, job title, and role and enable subcontractor portal access.

By having multiple contacts under a single contractor or supplier, you can choose which contact will receive a purchase order.