Potential VBA solution for wanting a cell to update its manually inputed contents once data is entered in another cell - excel

Question

I want data in the cells of column J to copy the data in the cells of column G once data is inputted into column G and not before.
However, prior to this replication taking place I would like to be able to manually update the price in the cells of column J.
See the attached photo for clarity.
Could anyone suggest a solution? I know VBA is a possibility, however, my Excel knowledge is not good enough to write code.
Yellow headings represent no formulas and blue represent formulas.
Excel_Worksheet_ TRADE LOG
Private Sub Worksheet_Change(ByVal Target As Excel.Range)
With Target
If .Count > 1 Then Exit Sub
If Not Intersect(Range("C:C"), .Cells) Is Nothing Then
Application.EnableEvents = False
If IsEmpty(.Value) Then
.Offset(0, -1).ClearContents
Else
With .Offset(0, -1)
.NumberFormat = "dd MMM yyyy"
.Value = Now
End With
End If
Application.EnableEvents = True
End If
End With
With Target
If .Count > 1 Then Exit Sub
If Not Intersect(Range("G:G"), .Cells) Is Nothing Then
Application.EnableEvents = False
If IsEmpty(.Value) Then
.Offset(0, 12).ClearContents
Else
With .Offset(0, 12)
.NumberFormat = "dd MMM yyyy"
.Value = Now
End With
End If
Application.EnableEvents = True
End If
End With
End Sub

Answer 1

A Simple Worksheet Change
If values in the column range from G2 to the bottom-most (last) cell of the worksheet, are changed manually or via code, the values of the cells in the corresponding rows in column J will be overwritten with the values from column G.
This solution is automated, you don't run anything.
Sheet Module e.g. Sheet1 (in parentheses in Project Explorer of Visual Basic Editor)
Option Explicit
Private Sub Worksheet_Change(ByVal Target As Range)
Const sCell As String = "G2" ' Source First Cell
Const dCol As Variant = "J" ' Destination Column Id (String or Index)
Dim irg As Range ' Intersect Range
Dim cOffset As Long ' Column Offset
With Range(sCell)
Set irg = Intersect(.Resize(.Worksheet.Rows.Count - .Row + 1), Target)
If irg Is Nothing Then Exit Sub
cOffset = Columns(dCol).Column - .Column
End With
Dim arg As Range ' Current Area of Intersect Range
Dim cel As Range ' Current Cell in Current Area of Intersect Range
For Each arg In irg.Areas
For Each cel In arg.Cells
If Not IsError(cel.Value) Then
cel.Offset(, cOffset).Value = cel.Value
End If
Next cel
Next arg
End Sub