In the grid input, on the "Edit" tab, click "Pitches":
Choose where you want to add or edit a pitch.
The mullions and transoms of a position are numbered. You can either use the numbering to define the start and end point of the pitch or enter the dimensions:
Click "Apply". The pitch is shown in the position drawing.
Remove specific pitch
In the grid input, on the "Edit" tab, click "Pitches".
Choose where you want to remove a pitch.
Click the "X" icon next to the pitch dimensions:
Click "Apply".
Remove all pitches
In the grid input, on the "Edit" tab, click "Pitches".