Hi Ajit,
I see you also opened support case 00892132 for this issue. kapad01 is looking into the issue and we will post the resolution here as well once we have it.
Here is a more detailed problem description for others in case they have also seen the issue and can comment:
1. We are trying to design a portal where all variables will list as a checkbox in dropdown on the portal.
2. If user selects only 3 variable out of 5 then only selected variable would display on the screen.
3. User can input data only for selected variable on the screen.
4. If user wants he-she can add another variable as per need from Self-service portal only.
Best regards,
Taylor