In the Cluster Edition, you can create global temporary databases (available cluster-wide to all instances) and local temporary database (available to an individual instance).
Navigate to Databases | Temporary Databases | List View.
Select Add Temporary Database wizard.
Follow the instructions outlined in the wizard, clicking Next to go on to the next set of instructions and Back to return to a previous instruction.
Click Finish when you are done. The temporary database appears in the right pane under the list of databases.