>Hand crafted parts: Lamps where the base has the cabels, the base, the socket, the uper part of the lamp, and one lamp can be paintet with diferent colors and then it is has a different part number.
In a company I worked, it was possible for one product to contain another, "intermediate", product. This could go through several levels of intermediate products. My system allowed this, and if you think you would need this (it can be quite useful, I believe), I can explain the basic structure for the materials (materia prima), the intermediate articles and the finished articles.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)