Yes, you can easity create a new slide master and store all your
new slide layouts in the new slide master in 4 steps:
Here is how to see all slide masters in the current template:
1. Click the View tab. You see the View tab menu showing up.
2. Click the Slide Master icon in the Presentation Views group.
PowerPoint changes the presentation editing view to slide master editing view.
3. Click Insert Slide Master icon in the Edit Master menu group.
A new slide master will be added as the last slide master in the left pane.
4. Review and modify default slide layouts added automatically to the new slide master.
5. Click the Close Master View icon in the Close menu group.
PowerPoint saves the new slide master with its layouts and
changes to the presentation editing view.
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