Sub NextCell()
Dim iWidth As Long
Dim iCol As Long
Dim iRow As Long
Dim oRow As Row
Dim oRng As Range
Dim oCell As Cell
Dim oTable As Table

    If Selection.Information(wdWithInTable) = True Then
        Set oTable = Selection.Tables(1)
        Set oRow = Selection.Rows(1)
        iRow = oRow.Index
        iCol = oRow.Cells.Count
        Set oCell = oTable.Cell(iRow, iCol)
        'If the cursor is not in the last cell of the table, move to the next cell
        If Not Selection.InRange(oCell.Range) Or _
           Not Selection.InRange(oTable.Rows.Last.Range) Then
            Selection.Cells(1).Next.Select
            Selection.Collapse 1
            GoTo lbl_Exit
        End If
        'Cursor is in the last cell of the table
        'Locate the end of the cell range
        iWidth = oCell.Width - 12
        'and add a right aligned tab
        oCell.Range.ParagraphFormat.TabStops.Add _
                Position:=iWidth, _
                Alignment:=wdAlignTabRight, _
                Leader:=wdTabLeaderSpaces
        'set a range to the cell with the cursor
        Set oRng = oCell.Range
        'remove the end of cell character
        oRng.End = oRng.End - 1
        'add a right bracket at the end of the cell
        oRng.InsertAfter vbTab & ")"
        'locate the first cell in the row with the cursor
        Set oCell = Selection.Tables(1).Cell(iRow, 1)
        'set a range to that cell
        Set oRng = oCell.Range
        'and insert a left bracket before the cell content
        oRng.InsertBefore "( "
        'and add a new row to the table
        Set oRow = oTable.Rows.Add
        'select the first cell of the new row
        oRow.Cells(1).Select
        'move the selection to the start of the cell
        Selection.Collapse 1
    End If
lbl_Exit:
    Set oTable = Nothing
    Set oRow = Nothing
    Set oCell = Nothing
    Set oRng = Nothing
    Exit Sub
End Sub