There will not be very much on the subject of networking in a business’s code of conduct. The reason for this is that there is not much that a person can do in the way of networking that a business would want to prohibit in a code of conduct.
In a code of conduct, a business might wish to encourage networking. This is because proper networking can help bring more business to a firm. The firm might say something in its code of conduct to the effect that networking is strongly encouraged. It might point out that networking can help the employee’s career in addition to helping the firm.
In terms of actually prohibiting anything having to do with networking, there is little that the firm can do. One thing it could do would be to caution its employees about divulging sensitive information in the process of networking. A firm might worry that its employees will give away its trade secrets while they are talking to people who work for competitors or that they might give away things like pricing information (how much the firm must charge in order to break even) while they are talking to prospective clients. If the employees give out this sort of information, they can harm the firm. Therefore, the firm might want to caution against this and divulging any proprietary information in its code of conduct.