Actually, it is not easy for employees to share their knowledge. They need some motivation to do it. So, manager in the company has the rule to do it. There are some ways to motivate them to be willing to share their knowledge well.
First is by implementing human resource practices in the company. Some human resource practices can help them to share their knowledge, such as giving some incentives plan. If the employees are rewarding when they are sharing some ideas, it can make them to do it more and more in another occasion.
Second, manager should empower their employees, too, so that they will have more power and chances to express their ideas and tell their experiences to others.
Third, provide a good climate for employees. If the environment supports their working, they will feel ease to tell something to others.