Update a repeating section field on change of form field

Hi,

I have a form with a repeating section consisting of three fields - components, component_branch and certification_branch. I want to update the value of component (select field) on change of a form field - base_release_version (select field). I am able to get the cascading select effect on another form field, os (select field) but I cannot get the change reciprocated inside a repeating section field. How should I do this.