Haven't done this in awhile, so not sure but it will put you in right direction
/includes/index_filters/default_filter.php
find:
Code:
// sort by products_sort_order when PRODUCT_LISTING_DEFAULT_SORT_ORDER is left blank
// for reverse, descending order use:
// $listing_sql .= " order by p.products_sort_order desc, pd.products_name";
$listing_sql .= " order by p.products_sort_order, pd.products_name";
break;
change to:
Code:
// sort by products_sort_order when PRODUCT_LISTING_DEFAULT_SORT_ORDER is left blank
// for reverse, descending order use:
// $listing_sql .= " order by p.products_sort_order desc, p.products_quantity desc";
$listing_sql .= " order by p.products_sort_order, p.products_quantity desc";
break;