By default, any object build you create is activated when you click. But by automating the initiation of object builds, you can create interesting effects and sophisticated animations.
Click Inspector in the toolbar, and then click the Build button.
In the Build Inspector, if the Build Order drawer isn’t open, click More Options.
In the Build Order drawer, select an item in the list and then choose an option from the Start Build pop-up menu.
You can also make several objects build as one object by grouping them (see Grouping and Ungrouping Objects).
If you choose to start the build automatically (rather than on click), specify how long to wait after the previous build finishes by typing a value in the Delay field (or clicking the arrows).
You can specify a delay up to 60 seconds.