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All Virtual Machines have a dedicated designated host pool. When Starting a VM, a host is chosen from the VM's dedicated designated pool only. If the pool does not have a host with enough resources available, the VM can not be started.
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Visible host pools are presented to the user when creating a Virtual Machine as Server class option, in which case the selected class/pool will be the dedicated designated host pool for that VM.
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End user is not allowed to change the designated host pool for an existing Virtual Machine. If such need arises it must be handled by platform admin.
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Although the host pool specific price list will only apply to CPU and RAM, it is advisable to define prices for all resources, copying them from the location specific or the global default price list. This will make it easier for users to read and understand price lists.
Running Virtual Machines are priced by their Current pool, so if the designated pool is changed, but the VM is not Stopped and Started or Migrated, it will be still priced by their current pool. This in accordance with user VM details view, where Server class will show Current pool for running VMs, no matter what their designated pool is.