Wordpress: How to add a header of main domain template to a subdomain page

I want to know how we can in wordpress get the header of main template (index - home page) to a subdomain (subdomain.example.com)

Thanks!

 

Install your wordpress software on a subdomain. Or you could buy a domain and redirect it, works the same.

 

install wordpress on the subdomain

 

I just want the header to display at the subdomain, not anything else.

 

then just grab the header image