use range object as part of a loop - excel

Question

I pasted the entire macro below but this is the important part.
Range("B2:B10000").Value = Range("B2").Offset(-1, 1).Value
Range("D2:D10000").Value = Range("D2").Offset(-1, 1).Value
Range("F2:F10000").Value = Range("F2").Offset(-1, 1).Value
Range("H2:H10000").Value = Range("H2").Offset(-1, 1).Value
It works as is except it is creating unnecessary data because I don't know how to use variable names in a range object. My ranges are currently hard coded such as ("A1:A1000"), when I would like it to be something like ("A1:A & LastRow).
Also I have to explicitly call out column names to copy because the range won't accept a variable name like ("currentColumn & 1:currentColumn & LastRow).
Is there a way to use a varible name as part of a range object so we can use them in loops?
Sub prepareWorkbook()
Dim wbk As Workbook
Set wbk = ThisWorkbook
Dim wks As Worksheet
Set wks = wbk.ActiveSheet
Dim colx As Long
Dim ColumnCount As Long
Dim MySheetName As String
MySheetName = "Import"
LastRow = sht.Cells.Find("*", searchorder:=xlByRows, searchdirection:=xlPrevious).Row
'copy the worksheet and rename it before editing
Sheets(1).Copy After:=Sheets(1)
ActiveSheet.Name = MySheetName
'identify the Id column and move it to 1st column
Dim answer As Variant
Dim IdColumn As Range
answer = Application.InputBox("Enter Letter of Id column")
If Columns(answer).Column = 1 Then
Else
'cut Id column from current location and insert it at column index 1
Columns(answer).Select
Selection.Cut
Columns("A:A").Select
Selection.Insert Shift:=xlToRight
End If
'trim the PartNumber column of any trailing spaces
Dim c As Range
For Each c In Range("A1:A10000")
c.Value = Application.Trim(Replace(c.Value, Chr(160), Chr(32)))
Next
' insert column every other column
' Loop through number of columns.
ColumnCount = Application.WorksheetFunction.CountA(Rows(1)) * 2
'step 2 means skip every other
For colx = 2 To ColumnCount Step 2
Columns(colx).Insert Shift:=xlToRight
Next
Range("B2:B10000").Value = Range("B2").Offset(-1, 1).Value
Range("D2:D10000").Value = Range("D2").Offset(-1, 1).Value
Range("F2:F10000").Value = Range("F2").Offset(-1, 1).Value
Range("H2:H10000").Value = Range("H2").Offset(-1, 1).Value
wks.Cells.EntireColumn.AutoFit
MsgBox ("Done")
End Sub

Answer 1

Assuming the you are running code in the Worksheet added here:
'copy the worksheet and rename it before editing
Sheets(1).Copy After:=Sheets(1)
ActiveSheet.Name = MySheetName
Also not sure what is the purpose of this code, nevertheless using it for the sample
Range("B2:B10000").Value = Range("B2").Offset(-1, 1).Value
Try this:
Dim lLastRow As Long
lLastRow = wbk.Worksheets(MySheetName).UsedRange.SpecialCells(xlLastCell).Row
Rem This updates only columns B, D, F & H - adjust as needed
For colx = 2 To 8 Step 2
With wbk.Worksheets(MySheetName)
Rem Creates Range as Range(Cells(rIni,cIini), Cells(rEnd,cEnd))
rem Corresponding code for "Range("B2:B10000").Value = Range("B2").Offset(-1, 1).Value" (see comment above)
Range(.Cells(2, colx), .Cells(lLastRow, colx)) = .Cells(2, colx).Offset(-1, 1).Value
End With: Next

Answer 2

Something like:
Dim LastRow As Long
LastRow = Cells(Rows.Count, "A").End(xlUp).Row
Range("B2:B" & LastRow).Value = Range("B2").Offset(-1, 1).Value
Range("D2:D" & LastRow).Value = Range("D2").Offset(-1, 1).Value
Range("F2:F" & LastRow).Value = Range("F2").Offset(-1, 1).Value
Range("H2:H" & LastRow).Value = Range("H2").Offset(-1, 1).Value

Answer 3

Although this answer won't be applied to your situation, I feel like this could help answer some questions you have in there.
When specifying a range, you can separate the column (letter) and row (number) and use your own variables.
In a for loop, this could look like
for i = 1 to 100
Range("A" & i).Value = Range("A"&i).Offset(, 1).Value
next
You can also determine the number of the row of the selected cell using:
dim RowNb as long
RowNb = (ActiveCell.Row)
This also applies to columns, and can be used in a loop like I mentionned at the start.

Answer 4

The one thing that was conspicuous by its absence in your description was any mention of the nature of the data in the worksheet. You mentioned A1 briefly but your range value assignments started at row 2 so it may be inferred that row 1 contains column header labels.
Sub prepareWorkbook()
Dim wbk As Workbook, wks As Worksheet
Dim colx As Long
Dim lc As Long, lr As Long
Dim MySheetName As String
Set wbk = ThisWorkbook 'no idea what this does
Set wks = wbk.ActiveSheet 'no idea what this does
MySheetName = "Import"
'no idea what this does or what sht is
'LastRow = sht.Cells.Find("*", searchorder:=xlByRows, searchdirection:=xlPrevious).Row
'copy the worksheet and rename it before editing
Sheets(1).Copy After:=Sheets(1)
With Sheets(2)
.Name = MySheetName
If CBool(Application.CountIf(.Rows(1), "PartNumber")) Then
colx = Application.Match("PartNumber", .Rows(1), 0)
Else
colx = .Range(Application.InputBox("Enter Letter of Id column") & 1).Column
End If
If .Columns(colx).Column > 1 Then
'cut Id column from current location and insert it at column index 1
.Columns(colx).Cut
.Columns(1).Insert Shift:=xlToRight
End If
'quickest way to trim trailing spaces is with Text-to-Columns, Fixed Width
With .Columns(1)
.TextToColumns Destination:=.Cells(1), DataType:=xlFixedWidth, FieldInfo:=Array(0, 1)
End With
' insert column every other column (working backwards toward A1)
For lc = .Cells(1, Columns.Count).End(xlToLeft).Column To 2 Step -1
.Columns(lc).Insert Shift:=xlToRight
Next lc
For lc = (.Cells(1, Columns.Count).End(xlToLeft).Column - 1) To 2 Step -2
'let's put the row-by-row value in instead of a single value into all cells
lr = .Cells(Rows.Count, lc + 1).End(xlUp).Row
With .Cells(2, lc).Resize(lr - 1, 1)
.Cells = .Offset(-1, 1).Value
.EntireColumn.AutoFit
End With
Next lc
End With
Set wbk = Nothing
Set wks = Nothing
End Sub
Explanations as comments in code.