Hi Kiran,
As a best practice, we need to have 2 different branch lines one for production and one test/acceptance environment. So if you do any fix in test environment. You can merge that fix commit alone in production branch line. Once merged you can deploy production branch line to production environment.
if you are also having 2 different branch lines, then merge fix commit from test branch line to production branch line and then deploy.
if you are not having separate branch line, then you need to create production branch line first.
To create production branch line,