Hello, @slw250@hotmail.com,
Yes we have, please watch the video’s here in our theme documentation: https://xstore.helpscoutdocs.com/article/59-03-how-to-create-a-mega-menu
And yes you can import the Pre Built Mega Menu Static Blocks using the XStore Studio as well, you have to go to Static Blocks and create a new Static Block, now using XStore Studio and import any of the pre-built Mega Menu as per your requirements: https://postimg.cc/GHs0zCfM
Hope this helps.
Regards 8Themes Team.