The new custom group banding type "Band for each distinct metric value" is introduced in Strategy Desktop 9.0.0, as shown below:

The banding type "Band for each distinct metric value" is used to create a separate band for each value calculated by the metric. This type of banding qualification directly uses the results of a metric as bands. It is very useful with metrics that already contain the logic needed to calculate sequential band numbers.
Usage of this banding type is explained below in Strategy Tutorial project:

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