You can use the Grid System tool to lay out a grid system for large structures. The grid system is useful when creating welded structures. The grid system is also helpful when you work with multiple users who use different third-party applications to make grids. Multiple users can use the grid system and work from the same baseline.
You can create a grid to help specify the location of key elements in structures. When you use the Grid System tool, you create a sketch to represent the grid. You can then specify the number of floors for the structure and the distance between each floor. The sketch is replicated for every floor in the structure. Balloons are attached to the grid items to help with orientation.
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| Grid system sketch |
Grid system with weldments applied |
Click Grid System 
(Features toolbar) or .
See SolidWorks® Help: Creating a Grid System.
The graphics area can appear cluttered when the grid system creates a lot of geometry or if you create multiple grid systems. To reduce clutter, you can hide the geometry. Display options are available to help you visualize the grid structure and to ensure correct grid inferencing.
To access the display options, in the FeatureManager design tree, right-click Grid System 
and click View Grid Components. In the View Grid Components dialog box, select an item and click a display option, such as Normal To 
.