Hey umair. You should be using the child theme no matter what.
As far as the category pages go, I dont think you can turn them into regular pages.
https://wordpress.org/support/topic/visual-composer-and-category-pages
With that said, you may be able to build your page using VC, then switch to classic view and copy the vc code into your child category page. I havent tested this, but I’ve done this with the registration page. Just put the vc code in a do_shortcode() call.
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