How do we export a Release(example from dev environment) with CLI and import to different environment (test) of BP

[Vikas]

I'm able to import in the same environment tough with 

.\automatec.exe /sso / Importrelease  <releasepath>

[JamesMan]

For a package that already exists, create a release and export it using:

AutomateC /exportpackage "HR Processes" /release "v1.4" /sso

If the /release <release_name> parameter is not specified, the name of the release will automatically be set to “<package_name> - Release #”, where the release number is incremented automatically.

Note that the package itself, where various processes, objects, tiles etc. are grouped must be created through the GUI first.  The .bprelease file will be exported to the folder where the command was executed and requires write permission to that folder.