We are trying to split our site map into 2 (or 3) sitemaps, so that we can exceed the 50,000 URL limit that otherwise applies to the Google Search Console, (formerly Google Webmaster Tools, I believe).
This initial task should be pretty simple (which is to simply ensure we are saving and loading the .txt files correctly) but it is also meant to allow us to build a relationship with an SEO and search and digital marketing expert. We only want to work with someone who has had prior experience with another client in managing their sitemap for a large number of products, or in boosting their SEO through expert knowledge of Google Search Console and other SEO techniques.
Note that we are using a Big Commerce store.
We have around 100,000 products (books), all of which have a single, standard landing page. Only half of them are currently going through the console, due to the 50,000 URL limit.
Here is the link from Google, outlining options.
If you have experience setting this up for other websites, please apply.
Thanks very much!