Test Collab does support importing test cases data
With Test Collab you have various options to bulk import test cases into your Test Collab instance. You can use XML, CSV or Excel format files for the purpose.
Amongst these CSV and Excel format options work for importing only test cases under a single test suite; while XML import option lets you import the complete hierarchy of test suites and test cases either at the root level or under a particular test suite.
More details on test case management and CSV import is available on online user guide article accessible at - http://support.testcollab.com/index.php?pg=kb.page&id=103
For details on using XML import option the article at http://support.testcollab.com/index.php?pg=kb.page&id=97 can be referred.
Importing test cases through Excel format files is explained here - http://support.testcollab.com/index.php?pg=kb.page&id=190