MCreator issue tracker has been migrated to GitHub.
Existing tickets have been migrated to GitHub. Please open new tickets on the GitHub tracker instead. If you do not have a GitHub account, all feature requests and bug reports from forums are still considered and checked by the maintainers.
There are some tutorials for this on the forums, just search a bit, but they don't have proper bounding box without custom code.
We have official stairs implementation on our todo list for the future versions too.