The GoogleBot uses XML sitemaps to get directions on how to crawl your site. We automatically generate a sitemap for you at www.<yourdomain>.com/sitemap.xml
You can give that sitemap to Google in your Webmaster Tools control panel.
Before you submit your sitemap, you will need to verify your site with Google. If you already have done so, you can skip this step.
If you don't like the sitemap that we generate for you and prefer to use your own, you can upload your own sitemap and submit it to Google. However we do not recommend doing this. The sitemap that is automatically generated should work fine for everyone. It updates when you add content or make changes to your site. If you choose to use your own sitemap, you will be responsible for manually updating it when changes are made.
Here are the steps to follow:
Add your sitemap to your webmaster tools account
1. Select 'Crawl' in the navigation on the left.
2. Select the 'Sitemaps' option.
3. Click 'Add/Test Sitemap' in the top right corner.
4. Input the URL of your Sitemap.
The default sitemap would be '/sitemap.xml'. Use the redirect URL if you are using your own sitemap, '/new/sitemap.xml' in the example above.
5. Click 'Submit Sitemap'.