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Explanation: Collazo gives a number of definitions (subconjunto, subgrupo, disposición, detalle de montaje, etc.), but this is the most used one.
Subgrupo means sub-group.
Disposición means arrangement
Detalle de montaje means assembly / erection detail.
See which fits your context, but I would go for subconjunto.
Robert INGLEDEW Argentina Local time: 09:37 Native speaker of: English, Spanish PRO pts in pair: 2664