Mega Menu

Hi.

I’ve a question about something.
I was wondering if it’s possible to make an mega menu with a code snippet, for Fitness Hub theme.
Is it possible/compatible to use a Mega Menu on this theme (and would you please share the code snippet with me or give me advice)?
For (future) security reasons: I don′t want to use plugins more than needed.

The reason for mega menu-code snippet: my/the client goes to extend their locations in couple of weeks and I want to organize the current menu in different categories for their two locations – so keep it clean and clear for the (new) costumers. Multi-site is an another option to think off, I want to keep it simple because for their online marketeers.

Hope you can help me with my question – thanks in advance!

Kind regards,
Bas