I recently kickstarted working on my portfolio again and since I work in B2B Enterprise sector, I can't really refer to most of the case studies online. So I went down a B2B design rabbit hole to find some good ones. Adding them in comments because..character limit.
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aarikamarinodesign.myportfolio.com/zipinvoicing
Aarika Marino - Accelerating invoice coding at Zip
Zip offers the most user-friendly procure-to-pay solution in the marketplace. With Zip payments, Accounts Payable teams can process and pay bills to vendors as quickly as possible.
aarikamarinodesign.myportfolio.com