That's the tricky part, unfortunately vmware probe does not provide us with the flexibility to choose which specific VM's to be monitored ,its either all the VM's or none
This has been a popular request to included an option to choose which VM's are to be monitored in vmware probe , but CA is yet to add this functionality .
One way you can try is to create a user with restricted permissions to a specific VM which you wish to monitor and use that user to configure the vmware probe so that it can query the data specific to certain VM's...may be that helps ?