Yes — this is one of the more valuable, practical things a good CSP partner does. Since they have visibility into your billing and usage, they can typically help identify what drove an unexpected spike (like a resource left running, an unoptimized configuration, or a one-time data transfer cost) and recommend fixes.
If you've had a billing surprise, it's worth reaching out directly rather than trying to piece it together yourself from the invoice alone — detailed usage analysis is exactly the kind of thing a partner relationship should help with.
Had a surprising Azure bill recently? We can dig into the usage detail with you and figure out what happened.