[ovirt-users] Can't understand Template Sub Version

Hi, All I'm using oVirt Engine Version: 3.4.3-1.el6, but I can't understand this function. I have 3 question: 1 How to change a vm to use other template sub version? I don't want to build a new vm from new template version. 2 How to update a pool to use other template sub version? I'm using non latest version, and shutdown all vm of this pool, but I still can't change template version. 3 How to create a pool with disable stateless function? In the property of template vm, I'm sure I don't enable "stateless". But in the testing, I found all the vm are stateless vm. How to disable it, or I'll lost all config and personal data. Thank you very much! -- Regards, John Xue