title: How do I relate a taxonomy with a custom field type, on another custom field type?
body: <p>I need to create a tiered relationship between posts in WordPress - I am using ACF (Advanced Custom Fields).</p>
  
  <p>The end result is to create menus (food menus).  There can be multiple menus (Breakfast, Lunch, Dinner), which will all have their own pages.  On each menu will be a section ("Bread &amp; Olives", "Starters, "Mains", "Burgers", etc.), and within that section will be the individual menu items (consisting of the name, description and price).</p>
  
  <p>Currently, I have this set up as:</p>
  
  <ul>
  <li>Menus - A custom post type, consisting of just a Title</li>
  <li>Menu Items - A custom post type, consisting of a title, description, price</li>
  <li>Menu Section - A taxonomy (category, not tag) of Menu Items</li>
  </ul>
  
  <p>The problem is that a section needs to apply to only a single menu, not multiple.  So, as the admin adding the menu items I need to be able to select the Menu it is linked to ("Evening"), which then populates a list of 'Sections' associated with that Menu.</p>
  
  <p>Currently I can only list all Menus and all Menu Sections, so I need to some how create a relationship between those two when adding a Menu Item.</p>
  
  <p>My question: How can I create this relationship, or am I approaching the problem incorrectly?</p>
  
  <p>Thanks</p>