Need to have a menu item's URL change to a different URL when clicked but it doesn't actually go anywhere just changes domain name

[sheyla]

This depends - is she planning on linking individual pages to a subdomain (similar to the main/root domain but with an added section ie: blog.website.com)) or a completely different domain?

If it’s a subdomain, you can follow these instructions:
https://support.wix.com/en/article/connecting-a-subdomain-to-a-site-in-your-wix-account