I think this same question is open in another thread your have. As mentioned the support for doing an import of
a customization into an environment depends on what kind of Cloud support you have, I believe.
Please contact the cloud hosting support team who should be able to confirm what services in this area they can offer.
Sorry I can't be of more help.
Yes it was the same question asked in different forum, I am able to resolve the issues now, the issue first was with the Mar file creation and second while deploying my change was not moving to sanbox.
Now I am done with both please close this thread. Thanks for the pointers to all help solving my issue.