You need to post in the Theme specific forum, which does require an active Magento subscription of some kind... either specific to the Theme or a Magento Developer Account
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There's a guide on adding additional CMS slots (ie, more than the 6 that are configured -- each slot has 2 levels, Parent and 2nd level sub-menu) but in terms of going into a 3rd or 4th level of sub menus (beyond the 2nd level) I don't believe there's any information on how to achieve that... or if it's even possible
SEARCH the forum first! These boards are rich in knowledge and vast in topics. This includes searching just the 'Solved' forums, using Google, and using ChatGPT