First, create a flipped ponytail on your top section. To do this, use the Topsy Tail tool or make a hole on top of the elastic with your finger, and pull the tail over the top and through it.
Then, create a second identical style on the bottom section, using the loose hair from both ponytails. The Topsy Tail can guide both ponytails into the space right above the elastic of the bottom pony, or try the trick with your fingers from above.
"Basically, thread the tail behind the elastic (close to your scalp), then pull the hair through the loop and pull the Topsy through when you are done with this step," Fugate advises.