Transports in BPC NW

Hi,

Can anyone please tel me the transactions used for the transports of BPC objects.

I have gone through the transport white papers but I am still confused about the transactions used by the basis to import the request.

If possible can anyone please explain the process of transport in brief:

Example:

1) Transaction to create the transport request- TCODE

2) Transaction to release the transport request- TCODE

3)Transaction to import the transport request - TCODE

4) Process in brief.

Please do suggest.

Thanks,

Bobby