I am trying to calculate volumes of different layers of asphalt and different layers of groundwork. I've created a template which contains all these layers, where the final groundwork layer is variable (slopes and ramps or not). In my template this layer's bottom points are defined by a slope constraint (50%) and a "Project to surface" constraint. This all works fine and I can get the volumes from a single corridor and its layers by clicking corridor reports and selecting corridor componet quantities.
However, when adding corridors for entry and exit lanes the volumes overlap, so when I calculate the volumes per corridor I will get parts that are counted double. I am looking for a way to either "merge" the volumes or extract them from one another at the parts where they overlap. I have tried selection one corridor and "Define target aliasing" and then selecting the other corridor, however the volumes of both are still present and mixed.
How can I substract these overlapping volumes in order to get the right volume quantities per layer?
Thanks in advance!