To Define the Location Callout Grid
Define a location grid on the format file (.frm) your drawing is referencing.
1. In a Format file click File > Sheet Setup. Alternatively, on the Document tab, click Sheet Setup.The Location Grid menu opens on the menu manager.
2.  Click Define.
3. Click one of the following to define:
Grid Outline—Specify the grid outline by using the rubberband box or by papersize (equal to the size of the page).
Grid Origin—Pick a point to indicate the grid origin. The lower right-hand corner is the default origin.
Columns—Specify the amount and location of grid columns by number or pick points, and then specify the grid labels by letter, number, or custom.
Rows— Specify the amount and location of grid rows by number or pick points, and then specify the grid labels by letter, number, or custom.
4. Click Done/Return.