Here are the steps to re-assign a Site to another FW by CO Manager or HDF. Assume you are reassigning Site1 from FW1 to FW2.
1. CO Manager logs in and clicks on 'Assign Field Worker to Site' menu item. Find the 'Site1' from the list which is assigned to 'FW1'. Delete this rule by clicking on the 'Trash Can' icon next to this rule. By doing this, you are making 'Site1' available for re-assignment.
2. Click on 'Add New' button. In the following page, you will see a Field Workers dropdown, 'Assigned Site' box which has set of currently assigned sites, and an 'Available Site' box which has sites of this CO which are not assigned to any FW.
3. Since you are assigning 'Site1' to 'FW2', select FW2 from the 'Field Worker' dropdown. 'Site1' must show up in the 'Available Site' box. Select the 'checkbox' next to the the 'Site1'. Click on 'Create' to assign 'Site1' to 'FW2'.
4. In the 'Assign Field Worker to Site' page you should now see the new rule you just defined.
Images given below are for you to understand how the pages referred to above, look like. The examples in the images are different.