ECS service registry

Hi team,

created 4 cluster using for each , each cluster having 3 service , in that one service is using load balancer and 2 using service discovery.
so we have 4 cloudmap namespace for4 cluster . created using for each , now how to assign these discovery in ecs service registry , like cluster one need to assign with namespace 1 service discovery, cluster 2 assign with namespace 2 service discvovery