- Ah in which case you're in luck, you're just looking in the wrong place
As per my first post, this fling was productized in vCenter 7.0U1c, so as long as your vCenter 7 version is later than that, you need to use the "import" function on the new vCenter, rather than try to migrate them from the old one. I did exactly the same migration from 6.7 to 7.0 and it worked perfectly.
The feature is called Advanced cross vCenter vMotion and i have written a blog post about it here:
https://www.virt-ed.com/post/advanced-cross-vcenter-vmotion
HTH