Do you use your BW for EP user stack? If so, you can just add the EP role you need in a group (role on ABAP) in user administration of your portal. If you are creating a new user afterwards and he has appropriate ABAP role, he will also get the PCD role on EP. It will be something like:
[group]
gid=Z_GR
gdesc=description
role=pcd:portal_content/folder/role
regards