Need to show default user dept in prompt according to user login

[madhansun]

Hi gurus,
  I have an requirements,that i need to show default dept in the value prompt according to the user login.
ex
User name - syam  dept - finance
user name - raj      dept - HR.

If syam is logged into the cognos reports he need to see his finacne dept as default in value prompt,can i know how can we achive this,please let  me know.


Thanks in advance
M