Hi Chrstine

As CSDM is a datamodel, it all comes down to what data to put where, in your example, you could consider, also looking at SPM, as your hierarchy, in the old-day, I used to have this hierarchy as Business Service -> Business Service - Service Offering, of course depending on how many levels.

Your Service Offering, is the record where you have SLA's, Commitments define for your customer/end users, so if you don't have specific SLA - Commitment for ex. Zoom, then just create Zoom, as and Application Service or Application CI.

This example her eis for O365, but you can change the Applications and Services as you need: