Using saved test objects in a keyword


I want to create a keyword (or a static class that contains only methods if possible)
and use saved stored test objects in it.
As for now, If I want to use my test objects in a method, my only option is to create a method inside a specific test case and call it.
Is there an option to create a ‘global’ method, which I can use in several test cases (like a keyword) which can execute standard Katalon commands like'Object Repository/LoginBtn')))