Using the object grids
Use object grids to precisely control the placement of objects (including T-squares) on a layout. When object grids are on, each object on the layout “snaps-to” its own invisible grid (which may be different from another object's grid). When you move or resize an object, it snaps to the nearest grid coordinate. New objects are created aligning to the “master” grid.
 
Choose Arrange menu > Object Grids. To turn it off, choose Object Grids again.
Press Alt (Windows) or Command (Mac OS) as you drag an object.
Choose Layouts menu > Set Rulers. In the Set Rulers dialog box, for Grid Spacing, type a value and choose a unit of measure.
Notes
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If you created objects before turning on object grids, they may not be aligned, and when you reposition them, they will move in accordance with their own grid.
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