You can duplicate the products menu by going into your CSSMenuWriter > cssmw_home > menu.php file. In here you can just copy the products <li> entry, it should start on line 56 and go to line 76.
If you copy this code and paste it just after this <li> you will have a duplicate entry for the products in your menu. You can change products to say Art.
If you add in another entry you will also need to adjust your widths on the menu to include this new entry. In the menu.css on line 52 you have the css for this. You will need to adjust the width, if I made it an even 100px it seemed to fit just fine.
menu.css line 52
ul#cssmw_home > li > span > a {
background-image:none;
color:#FFFFFF;
display:block;
font-family:Arial,Helvetica,sans-serif;
font-size:14px;
font-style:normal;
font-weight:normal;
height:24px;
margin:5px 0 0;
padding-top:12px;
text-align:center;
text-decoration:none;
width:100px; /* I updated this width to accommodate the extra entry */
}
If you want to alter what products are listed in the menu you will need to modify the query for the recordset that is pulling these results. You will need to update it so that it selects only the records you are looking for.