The workspace editor allows you to control the various aspects of asset management for RenderMan for Blender. To open the editor, go to the scene properties and output properties and click Open Workspace.
A new window should open that looks similar to the image below
Output Path
The root output path for all generated files for the scene. Can be referenced with the <OUT> token in other paths.
RIB Output Path
Controls the output path and naming of RIB files.
...