Пример объединения ячеек и выравнивания текста в Excel

MerCen('A4:J4');

var
  xls: Variant;
const
  xlCenter = -4108;

procedure MerCen(ran: string);
begin
  xls.Range[ran].Select;
  xls.Selection.HorizontalAlignment := xlCenter;
  xls.Selection.VerticalAlignment := xlCenter;
  xls.Selection.WrapText:= false;
  xls.Selection.Orientation := 0;
  xls.Selection.ShrinkToFit := False;
  xls.Selection.MergeCells := False;
  xls.Selection.Merge;
end;