If you want to track landing pages which are not in your standard sitemap, provide a custom sitemap.
You can supply multiple sub-sitemaps if needed by separating each sitemap URL on a new line.
Your sitemaps do not need to be accessible via your main sitemap, or anywhere on your website. These custom sitemaps can also be hosted in a third-party location, such as Amazon S3 storage.
Refer to the sitemap compatibility guidelines for the information your sitemap must contain.