To create a new distribution key, open the My Property tab and the Distribution Keys sub-tab.
Click on the Add Key button at the top right of the screen.
Name the new distribution key and select the units it covers. Then validate by clicking on the button at the bottom right of the box.
You can now use this distribution key to split provision requests, invoices, etc.
When a distribution key becomes obsolete, you can archive it. To do so, click on the Archive option on the right of the distribution key concerned (in the My Property tab, Distribution Keys sub-tab).