Depending on how often you need to do this (once or every day changes this):
If it's once, just write one blog entry, check in SQL its storage (depending on your blog storage choosen, if it's Joomla articles, it's in #__content SQL table. Then design a SQL query to insert the entries.
Then either execute manually in phpmyadmin if it's once, or if you want to automate the process, you can probably use CB Auto-Actions to trigger that SQL action.