I am not able to create the sub-packages in groovy folder

I am new to katalon studio and want to know below query:

I am trying to create the sub-package in groovy folder but i am unable to create it.
For eg : com.example.pages then i also want to create sub package like com.example.pages.userModuleA,
com.example.pages.userModuleB, and so on.
but its not letting me create and meaning its then replacing my first folder with my new folder.
i.e. com.example.pages.userModuleA replaces com.example.pages.userModuleA

When i was using eclipse for selenium-java , eclipse is able to create sub-packages.
so is it possible in katalon studio in any other way? or have anyone tried this. Please help.