Site map – OK to have 2?

I have installed WP 2.6 in a sub-folder on my website. For example, http://www.websitename.com/tips. Currently I do not have a sitemap created for my main site – http://www.websitename.com, or the WordPress install http://www.websitename.com/tips.

Can I create 2 different site maps – 1 for the main site, and another for the WP install location? Or, can I only have 1 site map to be located in the root folder on my main site? If I can I have 2, how would I submit the sitemaps to Google – the first as http://www.websitename.com, and the 2nd as http://www.websitename.com/tips or websitename.com/tips?

Thanks!

Simon