I'm attempting to automate the updating of a file in a stream using 'scm'

Here is how I think it should work :

1. Login to the repository as current user (me)
2. Create a new repository workspace which contains all of the components of a given Stream
3. Load the components of the newly created workspace
4. Update the file

I'm on point 2. Reading about the 'create workspace' doc on http://pic.dhe.ibm.com/infocenter/rtc/v1r0m0/index.jsp?topic=%2Fcom.ibm.team.scm.doc%2Ftopics%2Fc_scm_cli.html it does'nt mention how to create a new workspace which contains all of the components of a given stream. So how can I implement point 2 ?

Any comments on my methodolgy if can be improved upon also appreciated.