Gopal,
The only way to do this is to access the hidden properties of the step itself. This is not recommended, as your sequence file may not work with all versions of TestStand since Hidden Properties are subject to change and the TestStand API is the backwards compatible portion of TestStand.
To display hidden properties, Configure>>Station Options>>Preferences and check the box next to Show Hidden Properties.
The hidden property you are going to need to look at are:
Step.TS.SData.ViCall.VIPath
You will also have to programmatically create the parameters using this property:
Step.TS.SData.ViCall.Parms