height of the neck and inclination of the bonnets

[ChIP_83]

after creating a roof I saw that it is possible only or change the slope of the bonfires (also in %), or from view 3d (and only from this) change the height of the ridge.
practically the program goes to vary the "maximum height" parameter of the roof, which from the property card is not changeable.

Here, how do I change this parameter more accurately?
I mean, if I wanted to create a roof that in the lower part has a height of 2.20 mt. and internally at the neck a height of 3.20 mt; how do I do?

 

[gfrank]

you have to use the "slope arrows" for the specific layer, to which you check the starting and arrival quotas (you take into account the thickness of the roof).
after drawing the layer (without the slope in %) from a view of the plant, (always in edit/modification mode), uses the command "slope arrow" tracking an arrow from the line of the ridge to the one of the eaves. edit the arrow (selecting the same) and assign in the respective fields the starting and arrival quotas (level + possible offset)