Repeating group hover menu

Evening all.

I am trying to create a hove menu. I have looked at @fayewatson 's solution How to create a Menu Groups that appears when the user hovers over the menu title - #12 by vega.andrew , but my situation is slightly different.

I have an RG with product section names. I would like to hover over the name to show the category RG filtered by the section hovered over. Then repeat the process by hovering over the category RG names to show the relevant sub category RG names filtered on the category hover. The solution above does not work as I cannot select the RG item group to use in the conditional, and set states, etc.

Currently I achieve all of this by clicking the RG names, but this makes my UX a bit messy.

Any advice would be appreciated.