You can control the way sitemap is generated for all websites.
Website level configuration has higher priority and overrides this configuration settings.
To change the default global sitemap settings:
Navigate to System > Configuration in the main menu.
Select System Configuration > Websites > Sitemap in the menu to the left.
The frequency and priority options may be configured globally or specifically for product, category and the cms page level.
To customize any of these options:
- Clear the Use Default box next to the option.
- Select the new option.