I want to define the length of a pipe at the assembly level. What I want is called "Bulk Material" in Pro-E and can be defined from a table or a simple variable that can be requested upon inserting the component in an assembly. This is what I want to do. I want to have a single part file for 2" PVC pipe and have that part ASK me for a dimension, length in this case, whenever I insert it into an assembly. I don't want to use a design table with all lengths because I don't know ahead of time what lengths I will be using and this part will be used in multiple designs.