To wadsworth2,
For custom post types, you need to enable the features when you register them. Look here. Look specifically for the “supports” array, where you’ll add “excerpt” to the list of supported features. You’ll be doing something along these lines:
register_post_type( 'prefix_yourposttype',
array(
'labels' => array(
'name' => __( 'Your Post Types' ),
'singular_name' => __( 'Your Post Type' )
),
'supports' => array(
'title',
'editor',
'excerpt'
),
'public' => true,
'has_archive' => true,
'menu_position' => 20
)
);
Alternatively, you can also use add_post_type_support().
I hope that helps!