Hi Iuliana, and welcome to the forum!
>>how to tell the corresponded extract for replicat ( can this be done trough sql by using golden gate views?)Create Target Mapping
Select the Map icon for the Delivery. The list of candidate tables from the Capture mapping is displayed. The next step is to manually create the table mapping using:
Enter the Target table. Use the format <Schema.Tablename>.
Click on "Add Blank Mapping", the plus sign (+), when the extract uses a wildcard for table names.
Check candidate tables.
This may help:http://www.dba-oracle.com/t_goldengate_deploy.htm