Product A, B, C by some sort of material forming, such as A, which is formed by material x calculated consumption to x g, B, C,
A, B, C as products with "A" for the unit, and some part of the product D is composed of (A, B), so how to design data
Table (BOM), because each component materials unit

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The serial number, number, number, goods name, specifications, units, the higher number