Hello everyone, I ask for guidance because I'm going crazy.

I have an article (part) called "DN100 TUBE" with a fixed external circular section of 114.30 mm and a commercial length of 6000 mm (extrusion function).

I have to insert it in different assemblies and even several times within the same assembly, but each instance must have a different length, always variable, NOT STANDARDIZABLE, and above all independent from the part and from all the other instances.

What is the best way to achieve this?

Thanks in advance for your attention.