In ALM solution there is document model for Test Suite, that contains third level relationships to test steps. I.e. we have Test Suite related to Test Case using Contained By relationship, and Test Case related to Test Step using Test Steps relationship.
It is possible to select Test Steps id's by using following command:
im issues --fields="ID,Text,Test Steps" --queryDefinition="((relationship[ID] forwards using[Contained By]=441) and (field[Type]=Test Case))"
where 441 is Test Suite’s ID
But it's not possible to get other fields of Test Step like "Summary" and so on.
Need the ability to select all Test Steps for particular Test Suite. Accoring to the answer by PTC Support it is impossible to make such a query (Case C13611148). There was RFC 456039, but as I got to know "Due to the enhancement submitting policy changed, so the related RFC will not be updated anymore".
And also the same capabilities needed to export Test Steps using Gateway instead of using this (for ID's only):
Add following lines under <map name="CONTENT"> section:
<field internal="Test Steps"
The only way to get some kind of expected result is to use Report with template, for example, "Document Structure Traces – Tree View". But it is not quite enough.