Link Groups to Security Group
When you link groups to a security group, the units in those groups become visible to the members of the profiles in the security group.
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In System Administration → Security Management → All security groups, right-click a security group and select Link to Groups….

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In Available groups, select the groups, and click Add ->. To unlink a group, select it in Linked groups and click <- Remove.
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Click OK to save the changes.