Can I record UI steps of desktop application and then generate script of recorded UI steps

Hi,

About your main query, yes it is possible to convert your recorded steps to a script. You may refer to SmartBear's documentation here: https://support.smartbear.com/testcomplete/docs/keyword-testing/converting-script.html

Regarding recording the actions in Script, you can try the "Record this routine" option in the code editor.