aynrand1964, here are two ways,

Click on each cell in the tab order you would like while
holding down the Ctrl key. Now press Ctrl+F3 and give it
a defined name. Select that name from the namebox and tab
through the cells.
There is a limit of about 25-40 cells you can put into a Named Range due to
a
255 character limit in the Named range.

Or with a macro, have a look here

http://www.dicks-blog.com/archives/2004/07/06/tab-order-of-cells/