Same Header & Footer for Main site & Sub-Domain is against to SEO Guidelines?

I have a client site for Ex - site.com. Its blog site is blog.site.com

Main website site.com's menu bar is having 50 links, the same menu section with 50 links we have placed in the footer. Which means 50 links in the header and 50 links in the footer.

The same header (50 links) & footer (50 links) we are using for blog.site.com

Below are my queries.
1. Keeping the header (50 links) and footer (50 links) the same on the website will hurt SEO?
2. Shall I need to add nofollow tag for footer...

Same Header & Footer for Main site & Sub-Domain is against to SEO Guidelines?

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