Hi Naveen,
Good question! I would do the same thing as we did for the drop downs - building your own logic on top of the template. Here's a video -
https://share.smartbuilder.com/public/support/multiple_response_partial_scoring.mp4
As always, I encourage people looking to build advanced content
without using the templates. In the short term it can save time, but it restricts your capabilities. Some day your needs will outgrow the templates' capacity, and you'll have to build the content from scratch. And sometimes those requests come at the last minute from your stakeholders, and you'll find yourself scrambling to rebuild everything before a major deadline.