I know enough to be dangerous in Drupal, and this is likely quite easy, but I'm stumped. I have two content custom content types: Units and Chapters. Basically, when someone creates a new unit in Unit content type (field_unit_number), I want them to be able to select it from a dropdown in the Chapter content type (field_belongs_to_unit).
For example, if I create units one and two and each has three chapters, I want the user to have a selection within the Chapter content type that queries the available units and allows them to select one (and if more are added, select those).
Any help would be appreciated.