In Outlook how to create common event Categorize for the whole organization

Hello !Djeanthi2215 

Do you mean the color categories that you can add to emails and calendar events? 

If that is the case then yes you can deploy this to the whole organisation using GPO or Intune Configuration profiles. 

What you want to do is create a new reg key in the following path 
HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Preferences

And the key you want to create will have these properties

Type: String
Name: newcategories

Value: The name of your categories separated by ";" See picture below for example

Now after I have done the above change in my registry, If i Look in Outlook at my categories in the calendar I can see these new categories. 

Is this what you were looking for? 

If that is the case, you can deploy this reg key to your users via GPO or Intune configuration profiles 🙂 

Let me know how it goes or if you have further questions

If this helped solve your issue feel free to mark my reply as "best solution" 

Cheers

Oliwer Sundgren