You might like to check out Format | Cells | Alignment (tab) and then
Orientation 90 degrees for that cell.

The gridlines are either on or off - you can turn them off the printout
by File | Page Setup | Sheet (tab) and uncheck Gridlines about half-way
down the panel. You can also turn them off the display by Tools |
Options | View (tab) and uncheck Gridlines near the bottom of the
panel.

You now have much more flexibility by using Format | Cells | Border
(tab) - putting borders around those cells where you need them.

Hope this helps.

Pete