This is standard Poser Library usage. Click the Add Library button on the top right of the Poser Library, and select a Runtime folder. The name of this Library in Poser will be the name of the parent folder of the Runtime folder.

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)