Hi Amit,
You should be able to use your own custom token and still see the correct build number in the report. My question to you is which task are you using (from the CARA plugin). are you using the 'Run Deployment' or 'Run Process'?
If you're using 'Run Deployment', you should see the correct build number in the report, and if you don't, I would like to have a call and find the problem.
If you're using the 'Run Process', you will not see the build number because this task doesn't set the build number (because we can't assume that 'Run Process' performs a deployment).
Please let me know.
Gil