How to Map the MRVS field value to the custom table fields

Hi, 

I have a requirement where i need to map column values from MRVS to the similar column in ServiceNow custom table.

Let say in MRVS i have 3 columns 

1. Service Type

2. Region

3. Business Area

and i have similar 3 fields created in custom table. Now whenever i submit the catalog , all (3) column values from every row from MRVS should be mapped to custom table.