Send different Categories to different blog pages in same site

Hi guys:
we had someone design a theme for a site, and he set it up so that only one category would go to a blog. However, we are running three blog lists on our site. The blog lists are Press, Military and Racing.
How can I set it up so that each category goes to the respective page?
Below is the code

/**
 * do another filter, page "Press" only display the posts which category under "press"
 * and page "Hero Military" display all the posts but exclude the category "press"
 *
 */
// get category "press"
$category_name = 'press';
$theCategory   = get_term_by('name', $category_name, 'category');

$page_is = get_post_meta(get_the_ID(), 'page_is', true);
if ( $page_is == 'press' ) {
  // "press" page only display the posts which category under "press"

  if ( $theCategory ) {
    $baseARGS['cat'] = $theCategory -> term_id;
  }
} else {
  // "Hero Military" page display all the posts but exclude the category "press"

  if ( $theCategory ) {
    $baseARGS['category__not_in'] = $theCategory -> term_id;
  }
}

if ( isset($_POST['action']) && $_POST['action'] == 'get_posts' ) {
  require_once 'config.theme.php';
  require 'ajax/ajax_get_blog.php';
}