Making a Grid
If you are not using gridded fabric, you may mark a grid on the batting. Draw a line from top to bottom 2" in from the left edge of the batting, making sure the line is perpendicular to the top and bottom edges as shown in Figure A.
Continue drawing lines parallel to the first line every 4" across the batting.
Draw a horizontal line across the top, 2" down from the edge and every 4" below it to complete the grid.