My guess is that you are in the process of learning VBA and you have several headers that you want to apply this too. You want to see what the code looks like so you can edit for other procedures. Regardless if I am right or not below is a code that will do just that for you.
Code:
Sub DeleteDataBelowHeader()
'Code searches out headers and then deletes all data below that header.
Dim LastCol As Long, SearchString As Variant, HoldString As String
Dim CheckCol As Long, v As Variant
LastCol = Range("IV1").End(xlToLeft).Column 'Set the Final Column
SearchString = Array("testing", "testing2") 'Add more strings separated with commas
For Each v In SearchString 'Check all in the array
'Search each column for the header
For CheckCol = 1 To LastCol
If Cells(1, CheckCol).Value = v Then
HoldString = Cells(1, CheckCol).Value
Columns(CheckCol).ClearContents
Cells(1, CheckCol).Value = HoldString
End If
Next CheckCol
Next v
End Sub
This code uses Macropod's suggestion as well.
As with all code be sure to save your workbook before running because VBA cannot undo the operation after it is done. This code is assuming that your headers are on row 1.
Let me know if you have any questions.