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You could actually use a two-step workaround:
1. Use the Ulysses Project Exporter to export documents of your project to a new project.
2. Append this new project to the other project.
The current version of Ulysses has big problems opening two projects. This is more or less due to my silliness, and there are in face quite huge obstacles in the code.
Nevertheless, you definitely can expect dramatic improvements in the future.