You can run the code for the cboEmployees after the loop
Private Sub cmdOK_Click()
ActiveWorkbook.Sheets("DTS").Activate
Range("C15").Select
Do
If IsEmpty(ActiveCell) = False Then
ActiveCell.Offset(1, 0).Select
End If
Loop Until IsEmpty(ActiveCell) = True
ActiveCell.Value = cboEquipment.Value
'-----------------------------------------------
ActiveWorkbook.Sheets("DTS").Activate
Range("C16").Select
Do
If IsEmpty(ActiveCell) = False Then
ActiveCell.Offset(1, 0).Select
End If
Loop Until IsEmpty(ActiveCell) = True
ActiveCell.Value = cboEmployee.Value
End Sub