Hi,
its not that complicated you can first disable particular alarm (i.e. high CPU usage) on vCenter level ... then at Datacenter level
create two folders one for VM you want to exclude from CPU alarm second folder for remaining VMs.
Next just on second folder recreate CPU alarm to get it propagate to all remaining VMs.
When you create a new VM just place it to the right folder with desired alarm group.
Although its not optimal for your case ... you can also disable alarm actions at all for particular infrastructure object.
Just right click on VM - > Alarm - >Disable Alarm Actions