Forge objects in Halo: Reach/Structure
From Halopedia, the Halo wiki
The format of this page differs from the other pages listing Forge objects due to the Structure category only applying to a small number of maps, and including a very large number of parts.
Objects in the same section share a common part limit. Placing one reduces the number remaining for all the others in the same grouping.
Bridges and Platforms
Doors, Windows, and Walls
These parts do not have a category and are simply listed in the root of the "Structure" menu in Forge.