In a distributed setup, you can use the contact groups from the remote site to see only certain things provided by this contact group on the central viewer site.
If you have a distributed setup, where you enable WATO and manage the contact groups central, you can ignore this how-to.
Step-by-step guide
Config on the remote site
Create a contact group on the remote site
assign hosts and services to this contact group
assign the contact group to the user
Config on the central site
If you now login to the central viewer site, you will ony see the hosts/services you're a member of
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