Quando não configurado, sua skin vem com o sub forum assim:



Vamos ao que interessa:

Acesse seu AdminCP- Look & Feel- clique na sua skin- Board Index- boardIndexTemplate

Procure por :

Código HTML:
<ol class='subforums'>
        <foreach loop="subforums:$forum_data['subforums'] as $__id => $__data">
                <if test="showSubForumsLit:|:$__data[3]"><li class='newposts'><else /><li></if><a href="{parse url="showforum={$__data[0]}" seotitle="{$__data[2]}" template="showforum" base="public"}" title='{$this->lang->words['go_to_forum']}'>{$__data[1]}</a></li>
        </foreach>
</ol>
Substitua por:

Código HTML:
<ol class='subforums1'>
        <foreach loop="subforums:$forum_data['subforums'] as $__id => $__data">
                </ol>
                <ol class='subforums'>
                <if test="showSubForumsLit:|:$__data[3]">
                        <li class='newposts'>
                <else />
                        <li>
                </if>
                <a href="{parse url="showforum={$__data[0]}" seotitle="{$__data[2]}" template="showforum" base="public"}" title='{$this->lang->words['go_to_forum']}'>{$__data[1]}</a>
                </li>
        </foreach>
</ol>
Salve e após isso va em:


Look & Feel- clique na sua skin- Forum View- forumIndexTemplate:

Procure por:
Código HTML:
<ol class='subforums'>
        <foreach loop="sub_subforums:$forum_data['subforums'] as $__id => $__data">
                <if test="showSubForumsLit:|:$__data[3]"><li class='newposts'><else /><li></if><a href="{parse url="showforum={$__data[0]}" seotitle="{$__data[2]}" template="showforum" base="public"}" title='{$this->lang->words['go_to_forum']}'>{$__data[1]}</a></li>
        </foreach>
</ol>
Substitua por:

Código HTML:
<ol class='subforums1'>
        <foreach loop="subforums:$forum_data['subforums'] as $__id => $__data">
                </ol>
                <ol class='subforums'>
                <if test="showSubForumsLit:|:$__data[3]">
                        <li class='newposts'>
                <else />
                        <li>
                </if>
                <a href="{parse url="showforum={$__data[0]}" seotitle="{$__data[2]}" template="showforum" base="public"}" title='{$this->lang->words['go_to_forum']}'>{$__data[1]}</a>
                </li>
        </foreach>
</ol>
Salve e após isso va em:

AdminCP/Look&Feel/skin/CSS/ipb_styles.css

Procure por:

Código PHP:
     table.ipb_table ol.subforums {
                
padding-top6px;
                
margin-top5px;
        }
                
                
table.ipb_table ol.subforums li {
                        
backgroundtransparent url(http://forum.sosinvision.com.br/public/style_images/clean/bullet_black.png) no-repeat 3px 4px;
                        
color#606060;
                        
font-size0.85em;
                        
padding0 4px 0 15px;                  
                        
floatleft;
                } 
Substitua por:

Código PHP:
  .subforums 
                
float:left;
                
width:50%;
        }
        
        .
subforums1 {
                
width:50%;
        }

        
table.ipb_table ol.subforums {
                
margin-top:5px;
                
width:50%;
                
floatleft;
        }

        
table.ipb_table ol.subforums li {
                
backgroundtransparent url(http://forum.sosinvision.com.br/public/style_images/clean/bullet_black.png) no-repeat 3px 4px;
                
color#495457;
                
font-size0.85em;
                
padding0 4px 0 15px;
                
floatleft;
        }

        
table.ipb_table ol.subforums li.newposts {
                
backgroundtransparent url(http://forum.sosinvision.com.br/public/style_images/clean/bullet_green.png) no-repeat 0px 0px;
                
color#495457;
                
font-size0.85em;
                
padding0 4px 0 16px;
                
floatleft
Salve e após isso va em:

AdminCP/Look&Feel/skin/CSS/ipb_ie.css

e adicione isso:

Código PHP:
 .subforums {
                
margin-top:16px;
        }

        .
subforums1 {
                
margin-top:-16px;
        } 
Salve e veja como ficará seu Sub Forum.




Créditos:D4J
Fonte: SOSInvision