When I drag a Scroll To stack onto my Foundry Rapidweaver page it does not include a visible child stack. Went back to my receipt and downloaded the full foundry dmg and from that reinstalled the Scroll To stack. Still no child stack.
There is a good chance I'm doing something wrong but in the mean time as a temporary solution using the Show Package Contents option within finder I found the child stack called Foundry_Destination.stack. I then made a copy of the stack and then moved it into my stack directory and then opened the Info.plist within that stack and set the field hidden to No.
I also, later, did a search within this forum on the words Scroll To and found a discussion titled New Scroll To Stack? Within that discussion I found a Rapidweaver sample project by elixirgraphics which I downloaded and opened within Rapidweaver. I found a copy of the full stack including the child within the sample project which would allow me to copy and paste within my working project.
Rapidweaver Version 7.4.1 (18708)
Foundry Theme 1.0.1