You can either pop the New Sequence dialog (which requires user interaction to confirm the sequence name), or create a new sequence from a .sqpreset file (and specify the name); there is no API around the "make a sequence matching this project item" functionality, available from the Project panel.
I am able to create sequence using script but how can i import video clip to sequence using script
There is no publicly supported API to allow for that; you'd have to bring in a valid FCP XML file.
Still, there are a few things you could try...
Please write me directly [b b b at adobe dot com] with an overview (from the user's perspective) 's the entire workflow you'd like to support, and we can provide better guidance.