In graphical mode, you can drag-and-drop between objects to establish a new relationship, and then select the relationships themselves in the graphics object to display / edit the relationship information in the Utility view. In addition, you can switch the "Editor Style" (lower right of the editor) to table mode and edit the relationship in this way.
I will say this: Xcode 4.0 looks about half baked. Many of us were surprised when Apple released it.
Joshua nozzi
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