Setting a custom domain on blogger is very easy, however, blogger doesn't give you many options when it comes to hosting numerous site pages with different subdomains under the same site. You will have to open a different blogger blog for each subdomain you create.
Despite the challenge, blogger still remains one of the best blogging platforms on the planet. It basically offers the same kind of support a private server would in terms of traffic.
If you site is getting millions of hits per day, blogger will never charge an extra fee for handling the traffic and it guarantees you a 99.9 server up time, meaning you can have one site with more than more than 90 subdomains and no one will charge you for that.
If you bought your domain on Godaddy, here is how to set up a subdomain.
The first step of-cause be to Sign in to your GoDaddy account. Then Click on "My Account," and then click on "Domains." Click "Launch" beneath "DNS Manager."
Click on "Edit Zone" next to the domain name you want to use.
Related Reading: How to Upload a Dreamweaver Website to Go Daddy Hosting
Click on "Add Record," and then select "CNAME (Alias)."
Type the desired subdomain name in the "Alias" box. In the "Points To" box, type the following:
Click on "Save Zone File."
Sign in to your Blogspot account. Click on "Settings." Click on "Publishing."
Click on "Advanced Settings," and then type your custom subdomain in the "Your Domain" box.
Fill out the word verification puzzle, and then click on "Save Settings." Choose whether or not to redirect the primary domain to the subdomain.