By default, there is no functionality available to create a Bucket field for Record Types. The workaround is to create a custom formula field which could then be referenced in a User's report as a Bucket field. Please follow the steps below. Also, if you want this feature added to our future release, vote for Ability to Bucket by Record Type on our Idea Exchange.
Note: Bucket Fields are only available in Enterprise, Performance, Unlimited, and Developer Editions.
Note: Events and Tasks share the same custom fields under the "Activity" object in Setup.
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