One glb file.
I wonder if the 1st and 2nd floor models change their locations.
If you press the button, I want the first floor to come up to the second floor.
There isn’t enough information in your question to tell what you need? Can you add more detail, and ideally create a glitch or codepen describing your problem?
You can load GLB models in threejs and then modify or animated their position to do whatever you want.
Here’s the documentation on getting started with threejs: three.js docs
The short answer is YES.
The long answer is YES, but the change of locations depends on how the floors are defined in the GLB file and generated as Three.js objects after loading. If they are separate objects, you can move each of them by changing its position property. If they are one object with a single (or merged) geometry, you would need to find a way to tell which vertex to which floor belongs (e.g. by inspecting coordinates) … and then changing position is done by modifying vertices in the geometry.