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You can calculate your positions, P/L and risks based on different categories - Portfolio, Product Category and Trader. These categories are independent of each other, and can be used to perform calculations in the settlement of paper and physical trades transactions.

• Portfolio: Portfolio is usually

• 交易组合通常为公司业务划分的主要构架，具有层级关系比如：公司下面分为化工和有色两块业务，在有色业务下面分为有色现货和有色套保，以此类推。

• The transaction portfolio is usually the main structure of the company's business division, with a hierarchical relationship. For example, the company is divided into chemical and non-ferrous businesses under the company, and the non-ferrous business is divided into non-ferrous spot and non-ferrous hedging, and so on.

• Category: Category 品种是在交易组合下面的一个维度，可以进行再次却分交易属性。例如在有色业务下面又可以分为国际铜，内贸铜。

• Category is used to group various contracts. For example, in the spot copper contract, the varieties (category) may include standard copper and non-standard copper. By categorising them separately, you will be able to determine the positions and P/L of each category - standard copper and non-standard copper.

Variety is a dimension under the trading portfolio, which can be divided into trading attributes again. For example, under the non-ferrous business, it can be divided into international copper and domestic copper.

• Trader 交易员: Refers to trader name, has a similar nature as Category eg Trader A and Trader B etc.