Hi,
I need to group a column value in a chart, for example i created a view that display a Subcategory column from a custom entity, I need to display those value in a chart but i need to group them category, ex : the column values are SUBA1,SUBA2, SUBC1,SUBC2. instead of displaying all those value in the chart i want to display CAT1 that group (SUBA1 and SUBA2) and CAT2 that group (SUBC1 and SUBC2).
of course the example is just to explain the issue
thanks
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