You cannot, but for future you need have the same Change-Id for a patch, this is how gerrit identifies patches.

On Tue, May 23, 2017 at 11:43 AM, shubham dubey <sdubey504@gmail.com> wrote:
I just use 'git push origin HEAD:refs/for/master'
but it comes as new commit.

How I merge both?

On Tue, May 23, 2017 at 3:05 PM, Martin Perina <mperina@redhat.com> wrote:
Just add a file into the patch locally and push it again to gerrit, patch will be stored as new patch set.

On Tue, May 23, 2017 at 11:33 AM, shubham dubey <sdubey504@gmail.com> wrote:
yes I just forget to add that.
Can anyone tell me how to push the new changes to same commit?

Thanks,
Shubham

On Tue, May 23, 2017 at 1:27 PM, Code Review <gerrit@ovirt.org> wrote:
From Eli Mesika <emesika@redhat.com>:

Eli Mesika has posted comments on this change.

Change subject: core: backup flag added to storage domain static
......................................................................


Patch Set 1:

Did you forgot to add the relevant upgrade script that added that field ????

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Gerrit-MessageType: comment
Gerrit-Change-Id: I1453b52f4330d0e5cb12d8fa08426fd68f3cd329
Gerrit-PatchSet: 1
Gerrit-Project: ovirt-engine
Gerrit-Branch: master
Gerrit-Owner: shubham dubey <sdubey504@gmail.com>
Gerrit-Reviewer: Eli Mesika <emesika@redhat.com>
Gerrit-Reviewer: Greg Sheremeta <gshereme@redhat.com>
Gerrit-Reviewer: Jenkins CI
Gerrit-Reviewer: Maor Lipchuk <mlipchuk@redhat.com>
Gerrit-Reviewer: Martin Peřina <mperina@redhat.com>
Gerrit-Reviewer: gerrit-hooks <automation@ovirt.org>
Gerrit-HasComments: No