I have a read only grid contains 1 column with clickable link, when I will click on the link field then we want to open a grid consist of related data below that row.

There is already a similar thread going on -  [mention:c1471675607548f08684bda617bbaa45:46448885d0e64133bbfbf0cd7b0fd6f7] 

You cannot achieve that out of the box. You can look for a custom solution I proposed here - community.appian.com/.../128461