When you create test steps with parameters in test instance you can set up several test configurations (to run the same test with different set of parameters).
Test instance with params (and sets of params) could be used in another test instance as "Call to Test" (If it's marked as test template). But it looks like there is only one fixed set of params for 'Called Test'
The task is to pass params from calling test's "Test Configuration" to the called test. Is it possible?
P.S.: till now the best solution I have is to copy test steps and not to call it, but it will not be possible to edit these substeps just in one place any more (as they are not substeps but steps as it is). You will have to change them in every test instance they are used in.