Hello Venugopal,
You may want to review the IBM Docs site (formerly Apptio Help Center), which has a catalogue of instructions and examples pertaining to Apptio BI.
You can access the Docs site by clicking the "?" icon in the upper right corner of Frontdoor / Cloudablity.
There are several examples of Cloudablity Reports within BI which may suit your needs, for example this one on Compute:
https://www.ibm.com/docs/en/apptio-platform/apptio-bi/saas?topic=reports-compute-service-owner
Additionally there are detailed instructions on how to create Calculated Metrics, so if you are unable to find what you require in existing reports/examples these instructions should help you to craft the formula you require:
https://www.ibm.com/docs/en/apptio-platform/apptio-bi/saas?topic=reports-calculated-metrics