Add column to a Collection by picking values on another Collection

[emfuentes27]

I have a collection (groupedData) that groups and count identical items, and another collection (Colors) with color values. I never know how many items the groupedData collection will have, so depending how many rows it has it'll need to pick just the needed items from the Color collection, and add it as a new column:

ClearCollect(
    groupedData,
    SortByColumns(
        DropColumns(
            AddColumns(
                GroupBy(
                    AddColumns(
                        Filter(
                            'Catalog',
                            Year = ReviewYear
                        ),
                        "RO",
                        'Regional Office'.Value
                    ),
                    "RO",
                    "GroupedItems"
                ),
                "Count Value",
                CountRows(GroupedItems)
            ),
            "GroupedItems"
        ),
        "RO",
        Ascending
    )
);

Colors Collection:

ClearCollect(
    Colors,
 ["#FF6633", "#FFB399", "#FF33FF", "#FFFF99", "#00B3E6", 
		  "#E6B333", "#3366E6", "#999966", "#99FF99", "#B34D4D",
		  "#80B300", "#809900", "#E6B3B3", "#6680B3", "#66991A", 
		  "#FF99E6", "#CCFF1A", "#FF1A66", "#E6331A", "#33FFCC",
		  "#66994D", "#B366CC", "#4D8000", "#B33300", "#CC80CC", 
		  "#66664D", "#991AFF", "#E666FF", "#4DB3FF", "#1AB399",
		  "#E666B3", "#33991A", "#CC9999", "#B3B31A", "#00E680", 
		  "#4D8066", "#809980", "#E6FF80", "#1AFF33", "#999933",
		  "#FF3380", "#CCCC00", "#66E64D", "#4D80CC", "#9900B3", 
		  "#E64D66", "#4DB380", "#FF4D4D", "#99E6E6", "#6666FF"]
);

  How can achieve this? 

Thanks in advance.

[WarrenBelz · Accepted solution]

Hi @emfuentes27 ,

This blog of mine should assist you here. The below should give you an idea on structure, but note free-typed, so watch commas/brackets

With(
   {
      wColourNo:
      FirstN(
         Colors,
         CountRows(groupedData)
      )
   },
   With(
      {
         wGrouped: 
         ForAll(
            Sequence(
               CountRows(groupedData)
            ),
            Patch(
               Last(
                  FirstN(
                     groupedData,
                     Value
                  )
               ),
               {RowNo1: Value}
            )
         ),
         wColors: 
         ForAll(
            Sequence(
               CountRows(wColourNo)
            ),
            Patch(
               Last(
                  FirstN(
                     wColourNo,
                     Value
                  )
               ),
               {RowNo2: Value}
            )
         )
      },
      ClearCollect(
         colGroupedColors,
         AddColumns(
            wGrouped,
            "GroupColor",
            LookUp(
               wColors,
               RowNo2 = RowNo1
            ).Value
         )
      )
   )
)

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