This example inserts new cells to the left of the selected cells, and then it surrounds the selected cells with a red, single-line border.
If Selection.Cells.Count >= 1 Then
Selection.InsertCells ShiftCells:=wdInsertCellsShiftRight
For Each aBorder In Selection.Borders
aBorder.LineStyle = wdLineStyleSingle
aBorder.ColorIndex = wdRed
Next aBorder
End If