You can use the Runner System Wizard to create the gates and the sprue automatically.
Note: The Wizard automatically generates the sprue for your runner system. If you want to create the gates only, you will need to create them manually.
Click (Geometry tab > Feed System panel > Runner Wizard). The Runner System Wizard dialog appears.
By default, the wizard creates the sprue, the gates and the runners for your model.
Deselect the Create runners option(s) to create the sprue and the gates only.
Tip: Click Browse to quickly set the type of sprue and gates you want for your system.
Click OK. The newly created sprue and gates appear on the model.