its my working experience and experience with a lot of people who have been working on the way to get the best thing for me to do this for you guys

1. Save your favorite slides in My templates
Select your slides and click “Save in Library” from the ribbon or from the right-click menu.
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Open the Library and select “My Templates” in the drop-down list: your slides will be there!
Click a template to insert it: you can keep source formatting or use destination formatting.
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Your templates files are saved in C:Users<UserName>DocumentsPower-
userTemplatesMy templates. Open them and create sections to organize slides in categories.
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