VBA - Vlookup Multiple Columns and Fill to End of Range - excel

Question

I need to do a Vlookup of an ID on the source sheet to a table in the data sheet. When the Vlookup is done, it needs to return the cell values from 6 different columns.
Here I have a function to get the range:
Function find_Col(header As String) As Range
Dim aCell As Range, rng As Range, def_Header As Range
Dim col As Long, lRow As Long, defCol As Long
Dim colName As String, defColName As String
Dim y As Workbook
Dim ws1 As Worksheet
Set y = Workbooks("Template.xlsm")
Set ws1 = y.Sheets("Results")
With ws1
Set def_Header = Cells.Find(what:="ID", LookIn:=xlValues, lookat:=xlWhole, MatchCase:=False, SearchFormat:=False)
Set aCell = .Range("B2:Z2").Find(what:=header, LookIn:=xlValues, lookat:=xlWhole, MatchCase:=False, SearchFormat:=False)
If Not aCell Is Nothing Then
defCol = def_Header.Column
defColName = Split(.Cells(, defCol).Address, "$")(1)
col = aCell.Column
colName = Split(.Cells(, col).Address, "$")(1)
lRow = Range(defColName & .Rows.count).End(xlUp).Row - 1
Set myCol = Range(colName & "2")
'This is your range
Set find_Col = Range(myCol.Address & ":" & colName & lRow).Offset(1, 0)
'If not found
Else
MsgBox "Column Not Found"
End If
End With
End Function
Then in my sub, I select the range and do a Vlookup which fills this range:
Selection.FormulaR1C1 = "=VLOOKUP(RC[-4],myTable,2,FALSE)"
And this works great.
Then I needed to return more than just one column, so I ended up with the formula:
Selection.FormulaArray = "=VLOOKUP($C3,myTable,{2,3,4,5,6},FALSE)"
Source Sheet:
Data Sheet:
So, my function returns only the range for one column, which I think I can use in terms of getting a row count then using something like this:
Set myRng = find_Col("Product")
For currentRow = myRng.Rows.count To 1 Step -1
Selection.FormulaArray = "=VLOOKUP($C3,myTable,{2,3,4,5,6},FALSE)"
Next currentRow
Then perhaps instead of C3 it could look something like this:
C & currentRow --> Selection.FormulaArray = "=VLOOKUP($C & currentRow,myTable,{2,3,4,5,6},FALSE)"
But then I have the issue that only one cell is selected (G3) and from H-L is not. And I have no idea whether this is even a plausible effort.
Ideally of course, I would have cells G3:L3 selected and fill the formula down to the last row.
My brain is just fried from all the thinking and attempts.

Answer 1

So this should do the trick... I've explained every instance but if you need help understanding just ask:
Option Explicit
Sub FillData1()
Dim ws As Worksheet, wsData As Worksheet, arr As Variant, arrData As Variant
Dim DictHeaders As Scripting.Dictionary, DictIds As Scripting.Dictionary, DictDataHeaders As Scripting.Dictionary, _
DictDataIds As Scripting.Dictionary
Dim LastRow As Long, LastCol As Integer, i As Long, j As Integer
With Application
.ScreenUpdating = False
.EnableEvents = False
End With
With ThisWorkbook
Set ws = .Sheets("Results")
Set wsData = .Sheets("List")
End With
'Lets suppose your data always starts on row 2 in both sheets and column B will always have the max amount of rows filled
With ws 'filling the first array
LastRow = .Cells(.Rows.Count, 2).End(xlUp).Row
LastCol = .Cells(2, .Columns.Count).End(xlToLeft).Column
arr = .Range("B2", .Cells(LastRow, LastCol)).Value
End With
With wsData 'filling the data array
LastRow = .Cells(.Rows.Count, 4).End(xlUp).Row
LastCol = .Cells(2, .Columns.Count).End(xlToLeft).Column
arrData = .Range("A2", .Cells(LastRow, LastCol)).Value
End With
'Now lets put everything into Dictionaries so if the data moves columns or rows won't matter
Set DictHeaders = New Scripting.Dictionary
Set DictIds = New Scripting.Dictionary
For i = 1 To UBound(arr, 2) 'this will fill the headers positions on the main sheet
If Not DictHeaders.Exists(arr(1, i)) Then DictHeaders.Add arr(1, i), i
Next i
For i = 2 To UBound(arr, 1) 'this will fill the IDs positions on the main sheet
If Not DictIds.Exists(arr(i, DictHeaders("KW ID"))) Then DictIds.Add arr(i, 1), i
Next i
Set DictDataHeaders = New Scripting.Dictionary
Set DictDataIds = New Scripting.Dictionary
For i = 1 To UBound(arrData, 2) 'this will fill the headers positions on the data sheet
If Not DictDataHeaders.Exists(arrData(1, i)) Then DictDataHeaders.Add arrData(1, i), i
Next i
For i = 2 To UBound(arrData, 1) 'this will fill the IDs positions on the data sheet
If Not DictDataIds.Exists(arrData(i, DictDataHeaders("KW ID"))) Then DictDataIds.Add arrData(i, DictDataHeaders("KW ID")), i
Next i
'Finally will loop through the main array to fill it with the data from the data array
On Error Resume Next
For i = 2 To UBound(arr)
For j = 6 To UBound(arr, 2) 'I'm assuming you want to avoid the first columns which are hidden
arr(i, j) = arrData(DictDataIds(arr(i, 1)), DictDataHeaders(arr(1, j)))
Next j
Next i
On Error GoTo 0
With ws 'filling the first array
LastRow = .Cells(.Rows.Count, 2).End(xlUp).Row
LastCol = .Cells(2, .Columns.Count).End(xlToLeft).Column
.Range("B2", .Cells(LastRow, LastCol)).Value = arr
End With
With Application
.ScreenUpdating = True
.EnableEvents = True
End With
End Sub

Answer 2

I don't know if I got the true issue of your goal. However, since your Selection parts in your code should be avoid, why don't make something like the following?
Set myRng = find_Col("Product")
For currentRow = myRng.Rows.count To 1 Step -1
Range(Cells(currentRow, 5), Cells(currentRow, 9)).FormulaArray = "=VLOOKUP(RC3,myTable,{2,3,4,5,6},FALSE)"
Next currentRow