Use the Automatic Pattern Generation dialog to create a pattern between curves.
This dialog contains the following:
For Trochoidal Patterns, you can specify the Width, Radius and Direction.
The pattern that you create remains selected. This means that, if it is not the pattern you want, you can delete it by selecting Edit > Delete Selected Components from either the Patterns context menu or the individual pattern context menu. These options delete only the newly created pattern, not the curves used to generate them.