Navigate to the Menu and select Organisation and Users.
Click on the + icon next to the organisation in which the Organisation Unit sits.
Expand again using the + icon if necessary until you locate the Organisation Unit (if the Unit sits within another Unit).
Click on the Organisation Unit's name.
Your selection will be confirmed in the 'breadcrumbs' along the top of the page.
Click on the Details tab.
Click on Delete.
If you still have Users or child Units within the Organisation Unit you are trying to delete, you will see the following error.
You will need to Archive/move your Users and/or Archive/move any Organisation Units that sit within this Organisation Unit first.
If the Unit is clear however, you will receive the screen below. Click Yes to confirm the deletion.