The new UI supports the custom setting Show Favorite as First Category to display your favorite category at the top. 

To configure this setting,

  1. Go to Setup > Develop > Custom Settings > Config Select Product Settings.
  2. Next to Config Select Product Settings, click Manage.

  3. Select the Show Favorite as First Category check box.

Now, when you have multiple product offerings, you can quickly find your favorite category on the cart. For more information, see About Favorite Configurations on the Cart.