You can create alignment guides to help you place your text and graphics consistently on each slide. Alignment guides created on a master slide are available when you are placing objects on any slides based on that master.
Select the master slide to which you want to add the alignment guides.
Click View in the toolbar, and then choose Show Rulers.
Place the pointer on a ruler and drag an alignment guide to wherever you want on the master slide.
To place a horizontal guide, drag from the ruler at the top of the slide.
To place a vertical guide, drag from the ruler on the left side.