- Manually add a horizontal grid line
- Snap to turn it off
- Select the grid,
- right-click, and click Y axis / Add Grid Line
- Snap to turn it on
- Specify a point on the grid
- Automatically label grid lines
- Select the grid,
- right-click, and click Label
- In the Column Grid Labeling dialog box:
- Y – Labeling tab
- in the Number
field in the first line, enter A,
- press ENTER
- select Left, and Right
- Under Extension, enter 3000 mm.
- X – Labeling tab
- in the Number
field in the first line, enter 1,
- press ENTER
- select Top, and Bottom
- Under Extension, enter 3000 mm
- If after these steps you add again a new grid line
- follow the steps at the top to add label
