I come up with new issue i.e related to domain redirect. Can this be possible in blogger platform? that if you have existing custom domain and you want to redirect to a new custom domain in blogger. Remember you can do this with the help of .htaccess if you are using other platform and have access of cpanel files. But here things are different Google will not allow you to access their server so how you can do that?.
Here is some twist that you can redirect blogspot blog to custom domain by going through below settings:
Blogger dashboard > Settings > Basic > Publishing > Blog address
But how to redirect existing custom domain to new custom domain in blogger
Not sure whether it is the right section (SEO settings) to put such a query though I have not found the good one.