Connection .com to .org

I used to blog solely with a wordpress.com site and now I have transferred one my domains to GoDaddy for a www.remarpro.com site. But when I reblog from other sites, it posts to my old domain and I still need the old .com account because that’s how I host a few other domains. I have two wordpress accounts and it’s complicated…when I follow blogs and repost I want them to go through my .org account. How can I make these connect?