Hi,
Not exactly certain what you're trying to do with borders, but this being the "templates" portion of the Forum, I'll guess some type of border around the Description section.
A simple method is to create a one cell Table and place a border of X pixels with defined color. Heres' a simple code case with Red border of 10 pixel width...
<table bordercolor="#ff0000" cellspacing="0" cellpadding="0" width="100%" summary="" border="10"><tbody><tr><td> </td></tr></tbody></table>
If you paste that into the Auctiva Custom Templates creation tool, you'll see the result. Just insert your Tags, etc. inside the cell to create your template.
Hope that helps.
Danno