This wikiHow article teaches you how to create a custom PowerPoint template in Microsoft Excel. You can do this in Windows and Mac versions of Excel.
Steps

Step 1. Open PowerPoint
Double-click on the PowerPoint application icon, which looks like a white "P" on an orange background. This will open the PowerPoint home page.

Step 2. Click Blank Presentation
It's a blank slide to the right of the home page. In this way, you will open a new presentation.
On a Mac, simply opening PowerPoint could open a new presentation, depending on your settings. If so, skip this step

Step 3. Click the View box
This box is in the orange strip at the top of the PowerPoint window. Clicking there will open a toolbar below the orange stripe.
On a Mac, this option is in the top menu bar

Step 4. Click Master Slide
You'll see this option near the left of the toolbar in the "Master Views" section. In this way, you will open the "Master Slide" box to the left of the orange strip.
- On a Mac, first click Master's degreeand then in Master slide.

Step 5. Select a slide format to edit
Click on one of the templates in the options column on the left. There will be one slide for each type of slide that you can use (for example, a title slide, a core content slide, etc.).

Step 6. Click Insert Placeholder
It's to the left of the box Master slide. A drop-down menu will appear with the following options:
- Content. Insert a description of the content. On a Mac, you also have a "Vertical" option for the Content.
- Text. Insert a text box. On a Mac, you also have a "Vertical" option for the Text.
- Image. Insert a section for an image.
- Graphic. Insert a section for a chart.
- Picture. Insert a section for a box.
- Clever art. Insert a section for smart art supplies.
- Audiovisual. Insert a section for a video.
- Online Image. Insert a section from which you can add an online image.

Step 7. Select a placeholder
Click on one of the items in the drop-down menu to select it to add it to the template.

Step 8. Select a location
Click a place on the template to drag the placeholder item to that location.
- You may need to take additional steps before adding the element to your template. For example, if you click Online Image, you will be prompted to browse for an image and click Insert.

Step 9. Reposition the elements in the template
Click and drag the white space inside any section you've added to reposition it in the template.

Step 10. Change the background of the slides
Click on Background Styles and then select a color from the drop-down menu.
- You can also click Format background … from the drop-down menu to customize color options such as base color, gradient, and brightness.

Step 11. Select a template font
Click on Sources in the "Background" section, then click a font in the drop-down menu.

Step 12. Save the template
This process is different on the Windows and Mac versions of PowerPoint:
-
Windows:
Click on File, click Save as, select a location, and enter a name for the template. Click the drop-down box Save as type, then click PowerPoint template and finally in Keep.
-
Mac:
Click on File, later in Save as template, enter a filename and finally click on Keep.