Custom Permalink Structure for terms/taxonomies of custom post type

Create your custom taxonomies for your custom post type and for each, set the slug to include the findby portion, as in the example below for charity.

     'has_archive'           => true,
     'rewrite'               => array( 'slug' => 'findby/charity', 'with_front' => false ),
     'query_var'             => true,
     'public'                => true,

Create your custom post type with desired slug.

     'has_archive'           => true,
     'rewrite'               => array( 'slug' => 'postname', 'with_front' => false ),
     'query_var'             => true,
     'public'                => true,

     // include all relevant taxonomies, such as category, post_tag and your custom ones
     'taxonomies'            => array('category' , 'post_tag', 'charity')