You can add object builds to a master slide so that the build effects appear on every slide based on that master.
For example, if you plan to create a number of slides with bulleted text, and you want each slide to build in bullet by bullet, create a master slide with the desired build effects, and then use that master to create the rest of your slides.
Click View in the toolbar and choose Show Master Slides.
In the master slide navigator, select a master slide.
Define builds using the instructions in Moving Objects on or off Slides Using Builds.