Setting scroll 'anchor points' in Prototype

I’m creating a prototype of an app based on flat images.

Let’s say for the first 6 screens I don’t want anything to change in terms of scrolling. But screen 7 is very very long, and when the button on screen 6 is clicked, I want it to scroll down to a specific point on screen 7.

I have not been able to find any way to set an ‘anchor point’ and do this. Thanks!

UPDATE: I’ve found a way to do this by simply duplicating screen 7 and positioning it where I want within the frame. Not sure if this is the best way to do it but it works.