When I downloaded the test case from the test plan in QC then all the test cases field are downloaded except the test case design steps.
Can you please give me some solution of this problem.
you can follow below mentioned step to create TCs with Steps.
Please refer the screenshot for more details.
If you only need a few test cases, the following steps will work:
You will get one email per test case with a pretty list of test details and the design steps. I like to use this for working remote, where I don't have access to the HP ALM.
Caution: Calls to other test are not resolved, you just get the name of the called test.