On Xen Host , Create Template

My Servers - ( IBM x3650 - 64 GB Ram ) x 4
Frontend + Host 1 ( CentOS 6.6 - opennebula 4.12.1 - Mysql + Xen 4.5 + OpenvSwitch 2.31)
Host 2 - 3 - 4 ( NetBSD 6.1.5 - Xen 4.5 - OpenvSwitch)

On Marketplace Centos 6.5 Xen template is working very well.
But I do not creates any other Distributions Template.

Have any examples to create xen Template.
For example FreeBSD or NetBSD
Thanks for your help