Hi katerina75
I had some trouble understanding your workbook because not in English.
I think, below, is the correct code for you.
Sub Button5_Click()
Dim Action As String
Dim Customer As String
Dim CustomerCol As Long
Dim Αριθμό_θέσεων As Long
With Sheets("Sheet1")
Action = .Range("E4") 'column
Customer = .Range("N4") 'row
Αριθμό_θέσεων = .Range("K4") 'number
End With
With Sheets("planning")
CustomerCol = .Range("14:14").Find(Customer).Column - 1
.Range("A:A").Find(Action).Offset(0, CustomerCol) = Αριθμό_θέσεων
End With
End Sub