Hi,
You have total 200GB license which include license A,B and C.
Now answer to your first question, we can say preprod and prod environments have 150GB license. But it depends suppose your preprod environment is using 60GB license(50GB from license A and 10GB from license C), then prod environment have 140GB capacity only(50GB from license B and 90GB from license C)
You can check license usage by different Pool, that how many GB license used by that Pool. Even you can check Indexers used how much license.
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