Virtualization?

There is a very good program called jail(8)(). The man page says it all. Basically, it's another FreeBSD system, that has its on IP, its own devices, its own userland/ports and the only thing it shares with the parent OS is the kernel. This video on youtube is very informative.

But if you mean to create a computer cluster (so, you have many machines on the inside, but on the outside they all behave as one), I cannot really answer you. In such cases they usually speak to each other using a fast (W)LAN connection, but I don't know how to configure them (since at the time of this writing I don't have enough computers at home to try it). If you want to learn more on this topic, see "distributed computing"
 
It depends what you are trying to achieve. If you just want to spin up a VM to experiment with on a desktop system, use VirtualBox.

If it's a virtual server that has to remain up, either jail or if that doesn't provide what you need you may need to look into a hypervisor to host FreeBSD on bare hardware (Xen, ESXi, etc).

There is work in progress for a FreeBSD native hypervisor (bhyve) but it is not production ready yet.
 
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