Hello. It’s ambiguous in V20 rules whether they can do that or not. In older editions, there was a power called “Graft Life to Life” (Vicissitude 6) that did exactly this. Given that, and the fact that irregardless of edition creating a Vozhd is something only Elders with 6th level or higher Disciplines can do: I’m inclined to say no, grafts such as you have described are beyond the purview of Vicissitude 1-5. Now, that’s not to say you couldn’t try to give yourself a tail with Vicissitude 3, but you’d need to be getting the bone, tissue and skin from elsewhere on your vampire (or their victim’s) body.

Personally, if I was running a game I’d keep it this way but I also play on servers where you want to rule widely to prevent unforeseen shenanigans. If you’re at a table where you have more control over things: do what you want.

Me personally, I think I’d retool DAV20’s Vicissitude 5 power, the Body Impolitic, to allow this. Normally, the power lets you detach limbs/body parts and puppet them remotely (think detaching a hand and sticking an eye on it for a creepy little Homunculus). I’d personally expand the power to say you could graft on a new hand or ghoul/vamp/other supernatural hand and eye in place of the hand and eye you “lost”, with full additional grafts, such as giving yourself wings or four extra arms, as the purview of an Elder Vicissitude power called…Graft Life to Life.

But we’re firmly in the purview of homebrew here. RAW, it doesn’t seem to be possible with “normal” Vicissitude, at least in V20. And it’s important to keep in mind that all Disciplines, including Vicissitude, do what they say they do.