On the Configuration options, you can select to import the hierarchical Test Organization (migrate hierarchical information from HP ALM/QC's "Test Plan" to Xray's Test Repository).
If you need additional help we suggest contacting our support team here.
Since you have contacted our support, you probably already have this answered.
Nevertheless, here is the documentation of Xray's Test Case Importer, which describes how it works and the format it requires. If you can generate the information in the format that the Test Case Importer reads, you can use it to import it into Xray.
Rogério Paiva [Xray Support Team]
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