What you are probably searching for is to use iframe tags. A quick search shows a few tutorials that should help you.
http://www.ehow.com/how_12109858_add-iframe-code-blogspot.html
http://www.bloggerhacking.com/2010/04/iframe-to-add-another-blog-into-your.html
Also more details on iframes
http://www.w3schools.com/tags/tag_iframe.asp
Be warned it wont do wonders for your SEO