Hi,
Once your stored process has executed, the WORK library used for that stored process is closed. It is a different WORK library than the one available to you for EG.
One technique to use is to write your datasets to a library that is registered in the metadata instead of to WORK areas. Then if you have the correct privileges to that library, you should be able to access those data files from within EG.
There are ways to persist your session on the stored process server, so the WORK library is available to you for subsequent processing. You can find those techniques described in the documentation for the stored process server:
http://support.sas.com/rnd/itech/doc9/dev_guide/stprocess/sessions.html
http://support.sas.com/rnd/itech/doc9/dev_guide/stprocess/sesssamp.html
cynthia