No worries!
I see where you're at. If you're only starting with VAM, my advice would be not to use subscenes for now.
It's a pretty advanced feature that even "older" VAM users don't know about. It will because useful once you understand how the rest of VAM works.
First, try to play around with VAM, without thinking too much about how you can reuse things. You'll need to get the way it works; then it'll be easy to achieve what you want.
Quite importantly, atoms are way more than people. They can be everything. A person is just a type of atom (though the most complex). A subscene is also an atom. You'll find that a real benefit of VAM is than you can add any number of atoms in your scenes (environment, furniture, toys) without any constraint except your PC performance.
Look at presets. They are the best for reusability. The most useful are Pose presets & Appearance presets (you also have clothing presets, hair presets...).
For animating, Timeline has the ability to import/export animations. You also have Mocap (Motion Capture) that you can save using Animation presets, but I don't know much about this since I don't have VR.
Also, look at CustomUnityAssets atoms: they can be any 3D object, including full environments.
Then, just know that you can merge load a scene into another.
So technically there is no way using the subscene technique to port a pose, without also getting the model/apperance data?
There is indeed no way to have a "selective" subscene that won't take the appearance of a Person atom parented to it.
But you can easily change the appearance of your models after loading your subscene, using Appearance presets. And, voila!
Im coming from Klub17 where a "pose" = animation regardless of the number of "atoms" ( persons) in it and no model data included. That way It was easy to import a dual/thressome/foursome into any scene/room to get the animation and without the game switching model.
The Timeline import would be the closest thing from what you're looking for, since it has no link to your model appearance. But you'll have to import it for each of the animated atom. So it'll fit perfectly for solo play, but will be a hassle for dual/threesome/foursome.
You can also make it the other way around: make a scene with only the minimum of what you need, then change the environment around it. As I said, environments are atoms, and atoms can be added, removed, moved, modified...
It's the opposite of the behavior you know (it'll be importing the environment around your animated models instead of bringing your animated models to an environment), but the result is the same.
And finally,
VamX plugin could be the solution. I don't know for sure, I've never tried it.
It's a paid plugin, I don't know if you can save your own poses & animations or have to use the existing ones only.