Create a Design Template
All changes to the master slide, such as text formatting and adding the company logo, can be saved and then used again in other presentations that you create.
- Click File > Save As or press F12
- Type a name for the new design template in the File name: box
- Select Design Template from the Save as type: drop down box
- The Save in: box will switch to the Templates folder where PowerPoint's Design Templates are stored
- Click Save
The template is saved and can now be used when creating new presentations, or applied to existing presentations.