Draw your circle the size you want. Draw the curved path you want. Make it slightly longer than the diameter of the circle. Drag the curved line over the circle and position it. Use Object>Path>Divide Objects Below to create the new objects.
Uh, was that some ESP-level intuition Larry or was this a branched post?
How do i move those objects seperately?
We are going to need more details to help you.
Can you share the version of the software and operating system you are using.
Also can you list the steps you followed and maybe add screenshots