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How to:

Go to Plot Details: Plot Properties: Group tab, set Subgroup Size.
This means how many columns/bars will be stacked to become a new column/bar.
Go to Plot Details: Layer Properties: Stack tab, choose Offset to be Cumulative and check Use Subgroup (in Group tab) for Cumulative checkbox.

Subset in Normal Column Plot

Image Added

How to:

Go to Plot Detail: Plot Properties: Spacing tab, set Subsize Size and Gap Between Subsets(%).

This is for subgrouping within the same dataset.