First select precisely the cells to which you want to apply the new borders.
Then change the borders:
You don’t tell which Word version you use. In case of Word 2003 or earlier,
you can display the Tables and Borders toolbar. In that toolbar you will find
a tool immediately to the left of the paint bucket that lets you change the
individual borders (click the arrow to the right of the icon). You can also
use Format > Borders and Shading > Borders tab – make sure to set “Apply toâ€
to “Cellâ€.
In case of Word 2007, you will find the Borders and Shading icon e.g. in
Home tab > Paragraph group (bottom right icon):
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Regards
Lene Fredborg - Microsoft MVP (Word)
DocTools - Denmark
www.thedoctools.com
Document automation - add-ins, macros and templates for Microsoft Word