Browsing categories help

I have a sub-category within some of my categories and while most people will want to narrow down a search by viewing the sub-category, I know a lot of people would also like to just browse the whole main category.

It is a pain for the users to click each sub then go back and click another. Is there a way to click a "browse all" and see all the sub-categories ads together on one page?

I don't want to remove my sub-categories.
Thanks!

I updated and slightly changed my question from what it was previously - if anyone knows the answer that would be awesome

I went to default/categories/browse.tpl and the only code I saw matching $showlistings was:

{if $custom <> ''}
{include file=$custom}
{elseif $showlistings=="Y" && $sTemplate==1}
{include file="showlistings.tpl"}
{elseif $showlistings=="Y" && $sTemplate==2}
{include file="showlistings2.tpl"}
{/if}

and they are already set to "Y"

Am I in the wrong place?

Sorry about that!

Okay so what you said worked Yay
I simply changed the "N" to "Y" and nothing else.
However, when I look at my category is shows seven "Y" 's in text. It did not show that before.

Any idea how to fix it?

Thanks!

Here is the link: http://selloffroad.com/category.php?cat=parts

Also, changing that caused ALL the ads to show up below the browsing caterogies. Which is good, if I am on the main "Browse categories" page.

What I am looking for is if I click "Browse Categories" then I should see the categories available and below I should be able to scroll through all the ads on the website.

If I click "parts" then I should see only the ads in the sub-categories of "parts" to scroll through.

Is there a way to do that?

I hope that made sense.