Grid Systems are created using the Layout-Grids-Create/Edit command. Only unique Grid Systems need be created. It is not necessary to create a separate Grid System for each Layout Type if the Grids are identical between levels. A Grid System may be used by more than one Layout Type, and a Layout Type may use more than one Grid System.

To create a Grid System, specify the Grid System Label, the Grid System Type (Orthogonal or Radial), the X and Y offset (the distance of the local Grid System origin from the global origin) and the Rotation angle (the angle between the local Grid System and the global coordinate system), and select Add. In most cases where there is only a single Grid System associated with the Layout Type, the X and Y offset and the Rotation angle are 0.0.

To delete a Grid System, select it from the Grid System list and select Delete. If it is currently assigned to a Layout Type, an error message will be given, and the Grid System will not be deleted. In that case, use the Layout-Grids-Select command to deselect the Grid System from the layout types, and repeat the Delete command.

To change a Grid System, select it from the Grid System list, modify the value or values desired and select Change. If the offset or rotation values are changed, the entire Grid System will move, and any structural elements associated with those grids will move as well. See Moving Grids and Data for more information.

To Add, Delete, or Edit Grids that compose the Grid System, select the Grid System from the Grid System list and select the Edit Grids button, or double-click on the Grid System in the Grid System list.

When databases are converted from versions of the program prior to V7.0, the Grid Systems are automatically created from the Grids in the model. A separate Grid System is created for each layout type, and the label "Converted From:", with the layout type name, is given.