Simplest approach would be to use Bike > Edit > Copy followed by Ulysses > Edit > Paste. That will move your text content and tab-indented structure into Ulysses.
If you also want formatting information exported into Ulysses’s markdown format it’s more complex, but there are some existing scripts that can probably help.
- Bike Extensions Wiki
- Also just search the Bike form for “Markdown” to get some starting points