sub directory sitemap

Hi

How to create a sitemap for multiple subdirectory

http://www.mysite.com
http://www.mysite.com/site1
http://www.mysite.com/site2 etc.

In goole webmaster it only takes root domain only,

http://www.mysite.com/sitemap.xml.gz – this sitemap only takes,

how to create sitemap for sub directories