Grids are AEC objects on which you can anchor other objects, such as columns, and constrain their locations. Grids are useful in the design and documentation phases of a project.
There are several types of grids, each with its own purpose:
Layout grids help you position objects relative to each other in your building design.
Column grids are layout grids that place a column at each intersection of the grid as you add it to your drawing.
Ceiling grids are specialized layout grids that represent suspended ceiling systems or cassette ceilings. They can be anchored to a space object at ceiling height.
All of these grid types share some common features.
Grids can be used to anchor other objects. This is most visible in column grids, where special functionality allows you to anchor columns to the grid during insertion. Once the grid is inserted, you can add other objects to it as well.
There are 2 anchoring mechanisms available for grids: