This is Dallas from the Social Care Team here at Shopify.
I would love to help you with that. To be honest that is an easy fix that you can do without changing your theme. You will need an app and Mega Menu is just the thing. The best part is is that there is even a free plan available!
The other option would be to contact a Shopify Expert to see if they can custom code that into your theme for you.
One of these two options definitely should help you with what you are looking to do.
If you have any more questions please don't hesitate to let me know by replying to this forum.
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