Discontinuing a Contact in Dynamics 365 Business Central will hide it from Contact Lists and Contact Cards.

  1. Open the Contacts List and highlight the Contact that you wish to discontinue. 
  2. Select the Discontinue button which is located in the ribbon under Actions > General.

Alternatively, the steps above can be replicated on the Contact Card for a specific record by selecting the Discontinue button which is located in the ribbon under Actions > Functions.