Hi, I have virtualized FreeBSD 11 with Xfce on VirtualBox and I personalized it with the vertex-maia theme.
I have installed software tools, and now I want to make an ISO and move it for PC, has default system, not virtualized.
The simplest path to achieve that result is performing a backup, some manual partitioning and a restore from backup, plus installing a boot loader.
Making a ISO is entirely different story, much more complex.
FreeBSD provide tools to make customized ISOs, like the previously mentioned
release(7), but using that alone you will not be able to replicate your vbox install, more customization would be needed, like preparing your own packages ... in short it is a complex and very wide task.
As far as I'm aware there are no tools like Linux's "remasterme' or 'mylivecd' to simply prepare an ISO from a running system. Even when such tools exists, their use should be limited to restoring the original system, using them to deploy ISO images like if was an OS for itself is an error by design: too much things (settings and config files) are bound to the source machine, and distributing them is going to cause problems.
If your goal is to have the system on your PC, use backup/restore method, if instead your goal is to make your own ISO, that will require lot of work from you, it is not possible to provide step by step guidance without knowing exactly all details, and even if we know all details that would require a book: unlikely to happen.