I am trying to remove parent category from the child category but each attempt returns a 404 error.

Main Category Link (Displays All India Recruitment)

Child Category Link (Displays Sub-Category)

What am i looking for specifically

• I want my category hierarchy to remain intact when viewing category
  in the sidebars. However, I wish to remove the parent category from
  the child category in URL ONLY.

For example.

I want my child category link to have url structure as given below

www.governmentjobsvacancies.com/deputy-chief-mechanical-engineer/

Existing Format

www.governmentjobsvacancies.com/all-india-recruitment/deputy-chief-mechanical-engineer/

Please let me know if this is possible. I have tried multiple plugins and recommendations on various websites but each option returns 404 error.

I am hopeful, I will get some good help from wp experts.

My WP Version:4.5.1