With this dialog, you can choose to use the default values which will simply duplicate the part and supply a default spacing between the two parts.
Alternatively, in the Number of cavities box, enter the number of cavities you want to create. Decide how many rows and columns you would like, and enter the spacing between them. Click Preview to view the layout before you finish.
You can choose to connect all the cavities with runners, or use the Runner System Wizard to connect all the cavities, or model the runner system manually.