Third post in my series. Make sure you read Win10: Start Menu Cleanup using DefaultLayouts.xml and Win10: Start Menu Customizing using DefaultLayouts.xml first.
I’m not going to rehash on how to use PowerShell to export a LayoutModification.xml, but how you can make your own. For starters, read Microsoft’s Start layout for Windows 10 desktop editions
When installing Office 2016, it adds Shortcuts to ProgramData\Microsoft\Windows\Start Menu\Programs