I would like create several instance vituel on different schema of my main instance

 hello,

         I would like find a procedure to create 2 or 3 instances on my main instance who has different schema.

         By exemple :

               Main instance : WT9, port 1521 with schema wt9, WT9REC, WT9MNM
               and I would like create for the schema WT9REC an instance WT9REC virtuel with a port 1522,
               and I would like create for the schema WT9MNM an other instance WT9MNM virtuel with port
               1523,
          All these schemas are on the main instance WT9.

I hope I am clear in my explanations.

regards

JP