Earmarks (small numeric notes) can be added to any cell. They allow you to mark possible values for a cell. Earmarks allow you to store any number of digits in the cell. Each digit may be selected only once.

To add earmarks to a cell:

  1. Select the cell.

  2. Press Ctrl+1 through Ctrl+9.

You can remove a number from the earmarks by pressing Ctrl+1 through Ctrl+9 again.

You can also add earmarks by clicking the cell while pressing Ctrl, or right-clicking the cell, and then choosing a number.