New answers tagged hierarchy
An idea - did you consider putting dropdown menus into the breadcrumbs? It could look like this: download bmml source – Wireframes created with Balsamiq Mockups
Have the "add new" option within each level of the hierarchy at the place in which it would occur. This is simpler and removes some ambiguity about where the new element will be created. download bmml source – Wireframes created with Balsamiq Mockups
The tree model is more visual and easier to use than the "folder hierarchy model" (but certainly harder to code) You can grab inspiration in the genealogy website like myheritage but also on some hierarchy builder like Writemaps. Here is a quick mockup, I hope it will help.
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