Finally I have figured out a mechanism to host some How To's that I can share on this blog and here is my first How To on Field level encryption (partial encryption) using OWSM 11g.
I hope to post more How To's in the future...Comments welcome.
A few bookkeeping rules:
a) This is not part of official documentation from Oracle.
b) The steps may change from one version to another - so please keep that in mind. I have not tested this against all versions of the product - but I expect it to work with the versions I mentioned in the pdf.