Shoptimized Theme allow for Sub Collections?

[JJLea]

I have the Shoptimized theme. In my Mega Menu you click “ shop our collections “ and it’s a drop-down of my collections. Does anyone know if I can create Sub-Collections under those drop-down collections? I paid for the theme but bought the theme thru someone other than the developer, so they won’t help me, the person I purchased theme from said ,”they’re just the software company that helps get discounts on theme” , and Shopify can’t help, but were helpful. It may be a code issue and I can’t afford to hire anyone . I just need a “yes I can “ or “no I can’t” do sub-collections under collections, if anyone knows.