How to create sub category?

[gjh42]

We need to see your site to answer that.

[chrismaddox3d]

here is the link
www.chrismaddox3d.com

[gjh42]

Template Monster is notorious for disabling standard admin functions, so if something that ought to work doesn't, my first thought would be that they have bypassed or overridden it in the template code. You should ask them to fix what they have broken. You also have a problem with the sideboxes duplicating themselves, which I am sure the original TM code does not do, so you might have made some change that disturbs even the TM files. It's impossible to tell what from here.