as far as i know i dont think you can filter routes within an area since all routers within the same area should have the same LSDB used when building SPF. But you can filter inbound routes from another area if that's what you want using policy map. you can define a route map to prevent OSPF routes from being added to the routing table.
You can't filter LSAs (route-advertisements) within a Link State protocol. Other than running a separate AS as suggested above, the only other solution is to apply a distribute-list inbound on every router you don't want to receive a particular route. The LSA is still in the LSDB, and is still flooded to all neighbors, but is not installed into the routing table.
I agree with the two earlier posts. Options available to you are using a) either a different OSPF process between the two peers in question, and red-distribute between processes (if needed), or b) another IGP altogether and redistribute if needed. The latter option is in my view preferable as you have an easier way of recognizing routes when troubleshooting.
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