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Header grouping is a way to add a additional column above the header grid rows, so that they are grouped of desired way.
Typical implementation can look like the picture below.

We support two type of grouping - with colSpan enabled and colSpan disabled.
If the colSpan is disabled (the default) the headers that do not have grouping have a additional cell above it.
If the colSpan is enabled there is no additional cell above the non-grouped column.

Below we will provide the settings and a way how to do this.