Is there some Editor Extension out there, which lets you stack boxes on top of each other or adding prefabs to the scene?
Just wanted to ask you guys real quick.
These are known as modular workflows. Check out the asset store for tools, as well as packs, that can be purchased, even some for free. In the Unity preferences, you can also change the Snap settings, so that holding Shift will determine at what interval your GameObjects will ‘snap’ to when moving with the Move tool.
These kinds of assets are common with Medieval and Sci-Fi style games.
Is this what you’re looking for, or are you wanting modular control in game?