Contact groups allow you to group users and restrict communication between user groups in your organization. As with a channel, you can add any number of users from your organization to a contact group.
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Click on the
icon in the lower left corner and select "Organization settings." -
Select "Contact groups" (2nd from the top).
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Click on "Add contact group" in the top right corner.
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Give the contact group a name and specify whether a contact group channel should be created that automatically consists out of all the members of the contact group.
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Select the contact group members.
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Set restrictions for the communication channels. For more information, read the article Restrict communication paths between contact groups