I have a number of sites, at the moment I am developing http://www.moretonbay.biz. The issue is that I want to add members/contributors area and a directory to this site. This part of the site will have a different theme to the rest of the site.
I have never used subdomains before.
Can I create a subdomain, where I put all the pages/posts containing members/contributors and directory?
1. Would this work for the contributors and directory?
2. Would this have a negative effect on the main site?
3. Would this have a negative effect on the SEO?