 adding a reference field to an entity subtype goal add an entity reference field to an entity subtype see managing content structure for more information on entities and reference fields steps navigate to the page for managing the entity subtype you want to add the field to for example to add a field to a content type in the manage administrative menu navigate to structure   content types  find the particular subtype that you want to add the field to and click manage fields  click add field  in add a new field  select the type of reference field you want to add the reference section of the select list shows the most common types of reference field choose other  if the entity type you want to reference is not listed the label field should now be visible enter a label for the field which is used as the field label for both content editing and content display click save and continue  on the next screen verify that the type of entity you want to reference is shown in type of item to reference  or select it if not enter a value for allowed number of values  you can limit the field to one value per entity item a set number of values or set it to have unlimited values click save field settings  on the next screen optionally edit the settings for label   help text  text to be displayed below the field on the content editing page and required field  to make it so a value must be entered in order to save the content when editing in the reference type section you will usually want to limit the entity subtypes that can be referenced for example if you are creating a content reference you can check one or two content type choices the choices will be easier for content editors to scan if you also choose a sort value normally the entity title or label field click save settings  you should be returned to the manage fields page with your new field in the list  