Is there a way to assign multiple tags for each test and create test suites based on tags/groups like in the TestNG or Robot framework?
in def. of test suite you can search by tags, than just select TC with apropriate tags
Katalon Studio does not have a feature equivalent to the Group test of TestNG.
But Katalon Studio has a feature called Test Suite Collection:
Also a Test Case can call another Test Case
Test Suite Collection + Test Suites + caller Test Cases + callee Test Cases: this layered hierarchy provides you decent flexibility where you can reuse your testcases in many ways. Especially the combination of caller Test Case and callee Test cases can function, I think, similarly to the Group test of TestNG.