Hello Nikhil,
In Delphix Masking, you can pick and choose which schema, tables and columns in the database you would like to mask.
On a very high level, here is a sequence of steps:
1. Create connector to database (for each schema)
2. Create rule set (pick tables to mask)
3. Choose Inventory (pick columns to mask and apply masking algorithms)
You can follow the links for more details, mentioned by Jaclyn in the first reply.
Thanks