1. In [Settings] [Departments] click on your Organisation's name, so that it's highlighted in yellow.
Then click the green [▼] button and select [Organisation]
2. Complete the fields in the pop-up window. If none of your current workflows are appropriate for your new Department, you will need to create a new one. See: Create an Approval Workflow
Then click [Save.]
Note: [Default account] at this moment in time does not have any effect.
Your new Department has now been created.