Hello Ashok and Mouhssine:
This can be done by editing the filter option, by table in your rule set. First determine your requirements and which algorithm(s) to be applied for each. Multiple rule sets may be required and may only include the tables required for this step. Now you can edit the rules set and the table to apply your filter. Then update your inventory to apply to correct algorithm for the filtered result set and mask.
Tip: Please specify column name with table name prefix like customer.cust_id <1000.If you have other columns in the table to be masked make sure all rows are in the result set of your filtered rule sets.