I think it would be nice to have parent/child relationships for pools like posts do.
Sometimes, pools are parts or chapters of a bigger story. To make reading the whole story easier, these chapters are put into bigger pools.
I saw someone refer to these bigger pools as "masterpools", hence the title.
I don’t know if it’s possible to implement, but I have an idea for it anyway.
There could be a "parent" field the pool edit page to add a pool as a parent to an other, like for posts. Pools have their own unique ID number like posts do, and the post parent/child system relies on those ID numbers, so I think it would be possible.