There are many ways how to fully maximize the usefulness of your subordinates without incurring additional cost to your organization. Maybe, you could think of closely monitoring their job performance. You could also think of reassigning them to a department where you know that they are most qualified and competent.
For example if you have an accounting graduate who is working in the production department. If there's an opportunity it is best therefore to transfer him/her to the accounting department. where the organization could make full use of his/her knowledge in accounting.
Another method is not to limit your subordinates’ job to their assigned task only. We could think of using job rotation every now and then. This is for the reason that there are subordinates who truly desire to know more than what they presently know. And job rotation is the perfect management tool to address this desire.
When you use job rotation you also maximize your subordinates’ full potential and you expand their job knowledge. When you do this you are actually enhancing their job motivation because you’re addressing their psychological need to learn more skills. - Marino J. Dasmarinas