Multi-boot

[FreeBSD TWC]

I have previous FreeBSD experience, but have been inactive for a few years.

I used to partition disks with an MBR, and install multiple OSes and 
FreeBSD had a boot manager (now known as boot0) that allowed me to 
select which OS to boot.

I now have a new machine that uses UEFI and I can't figure out how to 
mimic the multi-boot menu.

It appears to me that I can no longer use boot0 because I'm using amd64, 
not i386.

I want to use EFI, GPT, and select OSes from a menu.  The efibootmgr man 
page appears to be incorrect.  I tried the example and it caused a 
syntax error.  There is no -d option (the command said -d ada0)

I was hoping to add another EFI variable and hoped it would allow me to 
select which partition to boot. I'm using FreeBSD 11.2-RELEASE.