K i think what you want to do is display the extra field on the product.tpl right?
K say you want it to display under the product name. You would take the product name code on the products.tpl:
<td valign=top>
{$products[product].model} {$products[product].product}</font>
<font size=1>
//Lets say Case price is param00, Unit Price is param01 and Pack
//is param02
Case Price: {$products[product].param00}
Unit Price: {$products[product].param01}
Pack: {$products[product].param02}
That would display the param's under the product name on the products.tpl page.
Hope that helped.