If you don’t use Studio, you can consider to try isc-dev tool, which is intended to simplify routine processes of import/export code, releases and patches.
Import it to e.g. USER and map to %All.
After that you’ll be able to import, export, release and patch in any namespace.
To work in a given namespace point the tool to a directory on the disk which contains repository in UDL or XML classes (preferablly UDL) with the following command: