The 
Pappocom software supports branching. If you haven't activated the feature, either go to 
View > 
Game Options or press 
F4. Then click on the 
General 2 tab. If it isn't already on, activate the 
Allow branching option. Click the 
OK button. Notice that you will now have three additional buttons on the toolbar.
When you are playing a puzzle you can start a branch by going to 
Edit > 
Start Branch or pressing 
Ctrl + 
J. If the branch doesn't turn out the way you hoped, you can return to the "root" by going to 
Edit > 
Reject Branch or pressing 
Ctrl + 
K. Otherwise, you can confirm your work by going to 
Edit > 
Accept Branch or pressing 
Ctrl + 
L.
Branching is explained more thoroughly in the documentation provided with the Pappocom software.