Its going to depend on what is available in your data and if you can overlay logic to existing tagging or if you have to introduce additional processing.
You mentioned the most common ones LOB, and App ID. From there which ecosystems those applications map to, what CC hierarchy those LOBs roll up to. Which environments for the apps (development, testing, production), and comparing spend across cloud vendors if applicable.
Once you have stable views there explore the Insights and Optimize sections in Cloudability. With a focus on Rightsizing, Savings Plans, and Anomaly Detection.
I would also recommend looking through the Apptio Value Explorer for reporting inspiration, taking the Cloudability training, and then ultimately the FinOps certification.
https://reference.apptio.com/#report:prd:reference.apptio.com:Data+Advisor/Apptio+Value+Explorerhttps://www.apptio.education/pages/4/apptio-product-certificationshttps://community.ibm.com/community/user/apptio/home