The process is:
- In Katalon Recorder open your test case and click on the Export {} button
- Using the Format Option dropdown, select Katalon Studio
- Copy the script using the Copy to Clipboard button (or use Crtl-A, Ctrl-C)
- In Katalon Studio open or create a blank test case
- Under the test case, select the Script tab
- Paste in your test script
Note, there may be some lines of the script that show errors. You will need to rectify those to successfully run the script.