Add an option in a builder

You can create a custom query with WP_Query to get all posts from your post type. This is how a basic query will look like, you just need to tweak it to your needs

<?php

// The Query
$the_query = new WP_Query( 'post_type=project&posts_per_page=-1' );

// The Loop
if ( $the_query->have_posts() ) {

    while ( $the_query->have_posts() ) {
        $the_query->the_post();
        echo '<li>' . get_the_title() . '</li>';
    }

}

wp_reset_postdata();