In the Autodesk Fabrication products, ancillary items, such as flange materials, channel, corners, bolts, and gaskets, can be created and stored in the database for items to use and to be costed automatically at takeoff.
Ancillary items can be added to items so that you can add more accurate costing, manufacturing, and installation time information to parts. However, it is important to understand that in the Autodesk Fabrication products, ancillaries have no graphical representation in the model. In other words, they do not display in the model. They simply allow you to add better costing data to the model.