•First step is to classify on the basis of purchase category.
| Class code | Materials |
| 00-10 | Raw and semi-processed materials |
| 11-20 | Machinery and mechanical equipment |
| 21-30 | Mechanical products and loose tools |
| 31-40 | Electrical products and equipments |
| 41-50 | Chemicals and chemical processing equipments |
| 51-60 | Chemicals and allied products |
| 61-70 | Furniture and fixtures |
| 71-80 | Office, laboratory equipments and stationeries |
| 81-90 | Fuels and lubricants
|
•In the second step, sub classification details of the materials, say, class code 21-30 i.e. mechanical products and loose tools is provided.
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