Maybe I am missing something obvious but can not find it yet. What I am trying to do is get (sub) totals for pipe lengths. In my project I have several types of pipe (e.g. Copper, Stainless Steel). For both types I have different diameters (e.g. 10, 20 mm).
What I want is the total length for each of the different pipes (i.e. Copper 10 mm, Copper 20 mm, Stainless Steel 10 mm and Stainless Steel 20 mm).
For the moment I only can manage to get the sub-totals for the pipe types, but not separated out by diameter.
What can I do to get if further separated by diameter?