Need an app that do menu drop down and organize category into 2nd subcategory and 3rd subcategory

[LLA]

Hi

I have spent hours on organizing categories  into sub categories to make it  easier for customers to search for women clothing in my store. I  having been looking for an app that could do drop down on the main menu page that divide category into its 1st sub category, 2nd, and 3rd category, but  I couldn't find any app that do it to make it looks  more professional. Please advise? Thank you