@Yasar mistry
Thank you for posting in Microsoft Q&A forum.
A WSUS server running in replica mode inherits the update approvals and computer groups created on an administration server.
If our WSUS server is running in replica mode, we will inherit the computer groups that you created on the upstream server. However, the computer groups will be empty. We must then assign the client computers that connect to the down stream server to the computer groups.
So we just need to create some empty computer groups on upstream server, then approve the patches for the empty computer groups.
You may refer to the official documentation for more details:
https://learn.microsoft.com/en-us/windows-server/administration/windows-server-update-services/manage/running-wsus-replica-mode
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