How do I add texture (UV Maps) to multiple meshes imported from blender?

So lets say i made a house on blender, the roof and the door textures are definitely not the same right? Does this mean that i will need to model the wall, the roof, the windows, and the door in blender separately, then port them over to roblox studios, texture them with their respective UV Maps and lastly group them together inside roblox studios?

Since no one answered, i went searching online, and saw this youtube video: https://www.youtube.com/watch?v=f2-FfB9kRmE

From the youtube video, it seems that we can unwrap multiple meshes in blender, pack both UV Maps together and edit it's UV Map in Photoshop. Else the only option left is like what I've said, port over multiple meshes and put them together like lego with their respective texture.