{foreach $list as $k => $link}
{$link.title}
{foreach $link.child_list as $child_k => $child_link}
{$child_link.title}
{/foreach}
{/foreach}
{foreach $list as $k => $link} {foreach $link.child_list as $second_k => $second_link} {notempty name="$second_link.child_list"} {foreach $second_link.child_list as $third_k => $third_link}
{$third_link.title}
{notempty name="$third_link.child_list"} {foreach $third_link.child_list as $four_k => $four_link}
{$four_link.title}
{/foreach} {/notempty}
{/foreach} {/notempty} {/foreach} {/foreach}