Preserve Context of selected record in SR Contact Object for button click

Summary: Under SR, object there is a subtab called Contacts which displays the list of contacts associated with the SR. in this subtab, We introduced a button which is calling a function(created at SR Contact level). The expected behavior is that the called function should work according to the record selected from this list but it always works at the SR level. Is there any way to select any contact record in this list and make the function be invoked for that selected contact record only.

Version (include the version you are using, if applicable): 25B