Sorry, I guess I didn't describe my use-case / workflow clearly. Here are some diagrams that probably don't do it justice.
The world map is a grid of 4x4 different screens/levels/areas/whatever, represented by a different-coloured square:
Each of those coloured squares is a separate, independent tilemap. What I want to know is: how can I set this up in Godot so that:
1) I can see the "overall" world map of all the pieces connected to each other, and
2) Assuming this is not just one giant map -- the player sees one piece at a time -- how do I technically pull that off?
My initial thought was to make each piece of the map a scene, and load/unload at runtime. But, if I do that, I don't see how I can view the entire map in one shot somehow.
I'm not even sure it's possible to do what I'm asking, to be honest.