brotherton-erpnext/erpnext/docs/user/CRM/contact.md

Contacts and Addresses in ERPNext are stored separately so that you can attach multiple Contacts or Addresses to Customers and Suppliers.

To create a new Contact go to ,

CRM > Contact > New

Or you can add a Contact or Address directly from the Customer record, click on “New Contact” or “New Address”.

Tip: When you select a Customer in any transaction, one Contact and Address gets pre-selected. This is the “Default Contact or Address”.

To Import multiple Contacts and Addresses from a spreadsheet, use the Data Import Tool.