Custom post category feed

Hi Guys,

I just started building my own WordPress theme today and it’s going pretty good. I’m just a bit stuck now.

I have built a custom post type called “Portfolio” and in it I have 3 categories.
I also have three custom pages that I want only the relevant category to feed into.

How do I do this?

This is my functions file:

<?php

//ADD MENU
add_theme_support('menus');

//ADD CUSTOM POST
add_action( 'init', 'create_portfolio' );

function create_portfolio() {
  $labels = array(
    'name'              	 => _x( 'Portfolio', 'post type general name' ),
    'singular_name'     	 => _x( 'Portfolio', 'post type singular name' ),
    'add_new'           	 => _x( 'Add New', 'book' ),
    'add_new_item'      	 => __( 'Add New Portfolio' ),
    'edit_item'         	 => __( 'Edit Portfolio' ),
    'new_item'          	 => __( 'New Portfolio' ),
    'all_items'         	 => __( 'Portfolio' ),
    'view_item'         	 => __( 'View Portfolio' ),
    'search_items'      	 => __( 'Search Artwork' ),
    'not_found'         	 => __( 'No Artwork found' ),
    'not_found_in_trash'	 => __( 'No Artwork found in the Trash' ),
    'parent_item_colon' 	 => '',
    'menu_name'				=> 'Portfolio'
  );

  $args = array(
    'labels'        		=> $labels,
    'description'   		=> 'Holds Portfolio work and portfolio specific data',
    'taxonomies' 			=> array('category'),
    'public'        		=> true,
    'menu_position' 		=> 5,
    'menu_icon'				=> 'dashicons-format-image',
    'supports'      		=> array( 'title', 'editor', 'thumbnail' ),
    'has_archive'   		=> true,
  );
  register_post_type( 'Portfolio', $args );
}

//ADD FEATURED IMAGE
add_theme_support( 'post-thumbnails' );

?>

and here is one of the custom pages so far:

<?php
/*
Template Name: Portfolio Page
*/
?>

<?php get_header(); ?>

<div id="portfolioPageHeader">
	<h1> <?php wp_title(""); ?></h1>
</div>

<?php get_footer(); ?>

Basically what I am trying to do is only have the featured image show up on the page and when you click it it then takes you to that post for more info.