Hello @Rob Blackin , Thanks for using Microsoft Q&A Platform.
As we know the Document Intelligence is billed by number of pages analyzed, and when a document is submitted for analysis, in general all pages are analyzed unless we set a page range in the "pages" parameter in the request: https://azure.microsoft.com/en-us/pricing/details/form-recognizer/
In your case, you can set the page range to these 2 pages and get charged for those pages that are analyzed, this should work. This is the best possible way otherwise you can directly upload the documents in chunks that are required. I have reproduced and this page range filter worked for me.
Please try this and let us know if you still have issues.
If you have billing issues, please raise a support ticket here: https://portal.azure.com/#blade/Microsoft_Azure_Support/HelpAndSupportBlade/overview
I hope this helps.
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