Hello Sunitha,
on the HANA trial on HCP you can do data modeling (e.g. creation of calculation views, ...), but you cannot do any administration tasks.
SAP offers via the Cloud Applicance Library (CAL) a free SAP HANA Developer Edition (at the moment v 1.0 SPS09). That means that you do not have to pay any license costs for SAP HANA. With that instance you can do the things you wanna do.
But of course you need to pay the computing time on AWS or Microsoft Azure (both are supported).
You can do a price calculation via the specific calculators:
At http://go.sap.com/developer/tutorials/setup-hana-for-cloud.html a short tutorial describes how to set up the developer edition in the cloud.
Best Regards,
Florian