To create a billboard, you would render each figure individually. You would then put that on a plane with a transparency. You then replace the figures in the scene. 

---

Available on Amazon for the Kindle E-Reader Monster of the North and The Shimmering Mage

Today I break my own personal record for the number of days for being alive.
Check out my store here or my free stuff here
I use Poser 13 and win 10