[cflsystems]

In skin1/modules/Upselling_Products/related_products.tpl inside the foreach after

          <td><a href="product.php?productid={$p.productid}"{if $config.Upselling_Products.upselling_new_window eq 'Y'} target="_blank"{/if}>{$p.product|amp}</a></td>

add

<td>{$p.descr|truncate:200:"...":true}</td>

If you want this for upselling products the code to add will be

<td>$product_links[cat_num].descr|truncate:200:"...":true}</td>

See if that works for you