Multiple categories for Shopify

Hello, I'm a shopify user and although this is an amazing place to have an online store, there's many limitations. One of these is to have multiple categories (categories, sub catogies, sub sub categories etc.). I'm looking for a custom app that will allow me to create categories, sub catogies, sub sub categories etc. Also I need these multiple categories to be easily added using a csv file. Theres already a similar app called Uncomplicated Categories on the shopify app store, but it doesnt allow what im requiring. Pleae contact me asap! Kind regards, Osman A