I did a search and could not find a page entitled "normal dial plan". I thought maybe you meant something else. So going back to the page Inbound Routes, you will see that the reference is as opposed to the inbound route dial plan.
With that said, why must a person create an inbound route (normally done by the use of Dialplan>Destinations), but never have to create a normal dial plan?
Further, my Dialplan Manager does not have plans, but rather has a long list of variables.
I trust you can understand the confusion this causes a new comer.