I've got no idea what you're actually asking. What VPNs? What pools?
Assuming that you're talking about GlobalProtect and IP Pools, there's not a direct way to view allocation across a single pool. You can view remote user information under Network -> Global Protect -> Gateways by clicking on the 'Remote Users' link, or by running 'show global-protect-gateway statistics gateway <gateway>' in the CLI. This will show you to total Current User and Previous Users which amounts to the current allocation.
Please keep in mind that this only gives you information at the gateway level. If you have separate client IP Pools depending on client configuration there's no easy way to get current IP Pool utilization. You'll need to manually go through and figure that out.
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