[OPIM U5] Specify workspace and workset with batch argument

Hi,

How do I specify workset (and/or workspace) when starting OPIM? Following the help document below, the batch switch seems to be -wp but that doesn't work. I've tried -ww as well and that didn't work either. In V8i, I can use the -wp just fine. 

https://docs.bentley.com/LiveContent/web/OpenPlant%20Isometrics%20Manager%20Help-v6/en/GUID-DFACEC10-39DC-4480-B7EE-F2FCDBD40186.html

Best regards,

Tuan Le