Jamil
The most common solution to send certain networks and not others to a neighbor in BGP is to configure a route map or a prefix list or a distribute list that specifies which prefixes to advertise and to apply this to outbound advertisements to a neighbor. You would need one route map/distribute list/prefx list for one neighbor and a different route map/distribute list/prefix list for the other BGP neighbor.
HTH
Rick
HTH
Rick