How to copy column from last column N number of times? - vba

Question

I currently have the following code, which was made by a lovely member here
Sub YearsNumberReduction()
Dim LastCol As Long
Dim DelCnt As Integer
DelCnt = Sheets("Panel").Range("E19").Value
With ThisWorkbook.Sheets("Current")
LastCol = .Cells(1, .Columns.Count).End(xlToLeft).Column
If LastCol >= DelCnt Then
.Range(.Cells(1, LastCol - DelCnt + 1), .Cells(1, LastCol)).EntireColumn.Delete
End If
End With
This code takes the last column, and deletes the column by the number of times specified in E19. How can I change the code, so instead of deleting a specified number of times from the last row, we can add columns instead? Essentially reversing the role of that VBA Macro.
I also have another question. In my Excel solution, I constantly add the number of years and decrease them (those years are business years and each year carries a profit, calculated by revenue-costs). On the main worksheet, I have 10 years. That is the default number of years. However, this does not change when I add or decrease years based on the function I mentioned. The profit for the 10 years is calculated by =SUM(B29:B39). How can I make the range change (e.g if I add one more year, Year 11 will be added and =SUM(B29:40) in the main spreadsheet which gives a profit overview?
Current adding of columns
Worksheets("Sheet1").Range("L1:L15").AutoFill Destination:=Worksheets("Sheet1").Range("L1").Resize(15, Worksheets("Panel").Range("E17") + 1), Type:=xlFillDefault
However, this adds from a fixed column, rather than the last. So I extend columns by 5, it will add 5, but if I extend it by 5 again, it wont extend since it has a fixed point. So I need it to change based on the last column.
EDIT
Year 1 Year 2 Year 3 Year 3 Year 3
Sales 100 115 132 132 152
Costs 30 32 33 33 35
Profit 70 84 99 99 99
Year 3 stays the same, and costs do not update (=C3*1.05) it should rise by 5%

Answer 1

Try the following. Assumes you can use column A to find the last used row:
Sub YearsNumberReduction()
Dim LastCol As Long
Dim DelCnt As Integer
DelCnt = Sheets("Panel").Range("E19").Value
Dim copyCol As Range
Dim DestRange As Range
Dim lastRow As Long
With ThisWorkbook.Sheets("Current")
lastRow = .Cells(.Rows.Count, "A").End(xlUp).Row
LastCol = .Cells(1, .Columns.Count).End(xlToLeft).Column
Set copyCol = .Range(.Cells(1, LastCol), .Cells(lastRow, LastCol))
Set DestRange = .Range(.Cells(1, LastCol), .Cells(lastRow, LastCol + DelCnt))
copyCol.AutoFill Destination:= DestRange, Type:=xlFillDefault
End With
End Sub