Hi Jacob,
Good question! You should be adding the water material inputs under the correct category. Assuming that the appropriate category is ‘External Works > Roads Paths Pavings’, click on the green ‘+Add External Works’ button next to the green ‘+Add Templates’ button.
In the pop up window, please input the data according to the notes in the image below.
Note that this method is applicable to ANY material that should be categorised under modules B2/B3.
