Edit the general settings

Settings- Contacts

  1. Click Contacts > General Settings - if using your Admin login or
    Click Settings > Contacts > General Settings - if using your User login.
  2. Select the Auto assign numeric client code for new contacts check box to automatically assign a client code when manually creating a contact, .
    For new sites, or if you previously used alphanumeric codes, the automatic numbering starts at 1.
  3. Click Save.