Help add extra 2 columns to tpl extension

Hello all, sorry if I post in the wrong post:

I am having a hard time fixing this problem. At the moment there are only 2 columns displaying root category with the sub category. Because there is a long list of sub category one have to scroll to the bottom page. So I need to add extra 2 columns to make it 4. This is the layout of the site.

{include file='t_javascript_language.tpl'}{set_css}
{set_js}


<!--<div class="componentheading">{$page_title}</div>-->


<div class="adds_man_list">
    <span>{$category_pathway}</span>
    {if $current_category->catname!=""}
    <div style="border:2px solid #000;">
        {include file='elements/display_fields.tpl' position='categoryicon' this_add=$current_category->id}
        
        <strong>{$current_category->catname}</strong>
        
        <div class="adds_subcat" style="text-align:right;background:#F5F5F5; border:1px solid #FFFFFF; " >
        
        {include file='elements/display_fields.tpl' position='categorydetails' this_add=$current_category->id}
        
        <span style="font-size:12px;">
        
        {jtext text="ADS_SUBCATEGORIES"}:   {$current_category->kids} {jtext text="ADS_ADS"}: {$current_category->nr_ads}
            <a href="{$current_category->view}" title="{jtext text='ADS_VIEW_LISTINGS'}">
                <img src="{$IMAGE_ROOT}view_listings.gif" class="ads_noborder" alt="{jtext text='ADS_VIEW_LISTINGS'}" />
            </a>                    
        </span>
        </div>
    </div>
    {/if}    
    {if $categories|@count<=0}
        <h2>{jtext text="ADS_NO_CATEGORIES_DEFINED"}</h2>
    {/if}
    <table id="adds_categories" class="ads_table">
    {section name=category loop=$categories}
    {if $smarty.section.category.rownum is odd}
    
    {/if}
            <td width="50%" class="adsman_catcell"valign="top">
                <div class="adds_maincat" {if $categories[category]->watchListed_flag}class="cat_watchlist"{/if}> 
                    
                    {include file='elements/display_fields.tpl' position='categoryicon' this_add=$categories[category]->id}
                    <a href="{if $categories[category]->kids>0}{$categories[category]->link}{else}{$categories[category]->view}{/if}" >
                        {$categories[category]->catname}
                    </a>
                    {if $categories[category]->is_new}
                        <!--NEW!!-->
                        <img src="{$IMAGE_ROOT}new.png" alt="new ads" />
                    {/if}
                    <a href="{$categories[category]->view}" title="{jtext text='ADS_VIEW_LISTINGS'}">
                        <img src="{$IMAGE_ROOT}view_listings.gif" class="ads_noborder" alt="{jtext text='ADS_VIEW_LISTINGS'}" />
                    </a>                    
                    {if $is_logged_in}
                        {if $categories[category]->watchListed_flag}
                            <img src="{$IMAGE_ROOT}watchlist.png" width="16"class="ads_noborder" />
                        {/if}
                        <a href="{$categories[category]->link_watchlist}">
                            <img src="{$categories[category]->img_src_watchlist}" width="16" class="ads_noborder" title="{if $categories[category]->watchListed_flag}{jtext text='ADS_REMOVE_FROM_WATCHLIST'}{else}{jtext text='ADS_ADD_TO_WATCHLIST'}{/if}"/>
                        </a>
                    {/if}
                    <br />
                </div>
                
                <div class="adds_subcat" style="background:#F5F5F5; border:1px solid #FFFFFF; " >
                {include file='elements/display_fields.tpl' position='categorydetails' this_add=$categories[category]->id}
                <br />
                
                {section name=subcategory loop=$categories[category]->subcategories}
                
                    {include file='elements/display_fields.tpl' position='categoryicon' this_add=$categories[category]->subcategories[subcategory]->id}
                    <a href="{if $categories[category]->subcategories[subcategory]->kids>0}{$categories[category]->subcategories[subcategory]->link}{else}{$categories[category]->subcategories[subcategory]->view}{/if}">{$categories[category]->subcategories[subcategory]->catname}</a> 
                    {if $categories[category]->subcategories[subcategory]->is_new==1}
                        <img src="{$IMAGE_ROOT}new.png" alt="new ads" />
                      {/if}
                        ({$categories[category]->subcategories[subcategory]->nr_a} {jtext text="ADS_ADS"})
                    {if $categories[category]->subcategories[subcategory]->watchListed_flag}
                        <img src="{$IMAGE_ROOT}watchlist.png" width="16" class="ads_noborder" />
                    {/if}
                    {if $is_logged_in}
                    <a href="{$categories[category]->subcategories[subcategory]->link_watchlist}">
                        <img src="{$categories[category]->subcategories[subcategory]->img_src_watchlist}" width="14" class="ads_noborder" title="{if $categories[category]->subcategories[subcategory]->watchListed_flag}{jtext text='ADS_REMOVE_FROM_WATCHLIST'}{else}{jtext text='ADS_ADD_TO_WATCHLIST'}{/if}"/>
                    </a>
                    {/if}
                    <br />
                    <p style="margin-left:25px;">
                    {include file='elements/display_fields.tpl' position='categorydetails' this_add=$categories[category]->id}
                    </p>
                {/section}
                </div>
            </td>
        {if $smarty.section.category.rownum is not odd}
        </tr>
        {/if}
    {/section}
    </table>
</div>

Code (markup):

Thank you in advance for your help

 

Thank you so much for your time and response.I have tried to replace {section name=category loop=$categories} with

{html_table loop=$data cols="first,second,third,fourth" tr_attr=$tr} but throws error at me. Any help on how I can implement the code will be very helpful. my website is (tt(dot)easy2sell(dot)net you can have a look of what the code is doing.​

Many thanks again for your time.