Unable to override Template files

I am using “Boss” theme which is related to buddyPress. I have create a child theme of “Boss”. Now, I want to do direct overriding like this
https://wensolutions.com/documentation/classified-developers/#doc-direct-overriding-13.
But I am not able to override files. I have created “classified” folder in my theme and create “templates” folder in it and putting my “frontend-submission-aditem.php” file in it. But it is also calling plugin files not mine override theme files. Can you please help me in these.