Item — Location — Channel option aggregates your data first by channel, then by location, and then, by item (see figure below).

Item — Channel — Location option aggregates your data by location, channel, and then, by item.

Location — Item — Channel option groups your data by channel, item, and then, by location.

Location — Channel — Item option aggregates the data by item, channel, and then, by location.

Channel — Item — Location option groups your data by location, item, and then, by channel.

Channel — Location — Item option aggregates the data by item, location, and then, by channel.