Use 'Move Object' command to copy paste the curves within sketch with motion type as per your requirement.
Also you can use 'Pattern Curve' command to create more copies of the existing curves with layout type as general. It will create the associative curves so that any changes made to the parent curves will be reflected to the patterned child curves.
It will give you more control over location of curves to be created rather than using simple copy paste.
If you want the copied curves to be non associative, simply delete pattern constraint associated with parent/child curves.