Install WP in a sub-folder

Sure it can. Read Installing Multiple Blogs ? WordPress Codex

Hi jasjot,
For this situation yes you can install another wordpress.
Like your currently site is https://www.example.com i suppose.then you have to make another wordpress installation in public_html directory say “blog” where you can put all wordpress files and directories.

if you don’t want to create seperate database then just its wp-config.php,put different table prefix having same database name.

then your site will look like https://www.example.com/blog.

Thanks
Shyam