Fill cell in table with line pattern

To use a hatch in Word.

1. Select the cell(s) you want to change
2. Right click and select Boarders and Shading
3. Click on the Shading tab
4. Under Patterns open the Style drop down and pick the hatch you want. The hatches are after the transparency settings.
5. In the Apply To: box select Cell

I use diagonal lines across the cell to indicate is was not used.

1. Select the cell(s) you want to change
2. Right click and select Boarders and shading
3. Change the Apply to: to Cell
4. Click the diagonal boarder button
5. Click OK

Results in a diagonal line through the cell. You can change the type of line and pattern to your liking.