Hi ssands,
Internal requirements look similar to external ones (ie the ones that are proper elements), but they are in fact very different inside EA.
As I'm sure you know, you can turn an internal requirement into an external one (which creates a Requirement element), but it's a one-way street -- you can't turn an external requirement into an internal one. External requirements are proper elements and as such have far more information associated with them than a simple internal requirement, which only contains what you see in the properties dialog.
So no, there's no built-in function to import internal requirements, and there's no out-of-the-box solution to import them as external requirements and then move them to internal ones.
If you only have a small number of requirements, what you can do is drag-and-drop them from the document into the properties dialog of the class.
For some reason, the Requirement text field does not allow you to drop text into it (EA 11.1), but the Notes field does. So you can drop the requirement name there and then cut-and-paste it to the Requirement field.
Not a truckload of fun, I agree, but if it's only a couple dozen requirements and if it's only a one-off thing it shouldn't be too bad.
Cheers,
/Uffe