Open demo5.gpn. On Monday, teacher "New" is absent. Newton would have had 4 periods to teach on this day. The first period is to be cancelled. Go to the substitution line with your mouse and click on the <Cancelled> 
button. Clicking on this button a second time turns it back into an uncovered substitution.
Tip: How to cancel a lesson via the keyboard
Enter "-" for the substitution teacher to cancel a lesson. Clicking on <Del.>, it changes back into an uncovered substitution.
Enter "-" for the substitution teacher to cancel a lesson. Clicking on <Del.>, it changes back into an uncovered substitution.
Tip: Only show uncovered substitutions
When you check the "Uncovered substitutions" box, only those substitution cases are shown which still need editing.
When you check the "Uncovered substitutions" box, only those substitution cases are shown which still need editing.