A string field can not be added as a breakdown in Performance AnalyticsDescriptionCannot add string field as a breakdown in Performance Analytics.Release or EnvironmentAll ReleasesCauseBy design, breakdowns can be only applied to reference/choice type fields. String fields are not structured data and it will accept any text as input. This is the very reason why the development team has restricted.ResolutionCreate a new field of reference type, copy the data to the new field and try to add the new rerference field as breakdown.