The value in number is automatically retrieved from your calculation in Geometra (the drawing attached).
It is also possible to fill in the value manually.
Under number, you can open the tabs room dimensions and measurement image.
Under the measurement image, you see the figure of the measurement and can choose which values you want to use for the selected treatment.
In the column you can use formulas where letters symbolize the values from the measurement eg V1 + V2.
In this way, we can then specify one or more walls in a room with different AMA codes.