In Inventor 2016 there is a new function that you can use to inherit the part number from the CC. The part number in the BOM is however still always based on the length of a specific pipe segment. We want full control over the part number, we really want to INHERIT the part number from the CC so all our pipes of the same diameter & schedule will roll up in the BOM.
This is the forum topic where the functionality is discussed: http://forums.autodesk.com/t5/inventor-general-discussion/t-amp-p-conduit-part-number-settings-2016/...