The following macro needs tweaking and I am not able in any way...could
someone please have a look at it and help me!
1) When I run the macro the following error appears:
runtime error 91... Object variable or With block variable not set.
If I substitute rngNd with "C1:C20" no error message comes up.
obviously I would like to use rngNd.

2) I have tried entering "*" & strPO (which works for finding text earlier
on in the macro) but when applied as shown below it does not work.

Dim strCtr As String
Dim Cell As Range
Dim LastR As Long
Dim rngNd As Range

LastR = Cells(Rows.Count, "C").End(xlDown).Row
rngNd = Range("C1:C" & LastR)

strCtr = Application.InputBox(prompt:= _
"Inserisci Nome Contratto")

For Each Cell In wksTo.Range(rngNd)
If Cell.Value = "*" & strPO And Cell.Offset(0, -2).Value = 0 Then
Cell.Offset(0, -2).Value = strCtr
End If
Next Cell
End Sub

Thanks in advance.