You need to export the private key of the address that holds the funds, and if I understood you correctly you'll need to do it from Armory. Start Armory in offline mode, choose Advanced Mode, export the private key and import it into multibit or blockchain.info to regain access to your BTC.
Thanks for the replies - I Sent BTC from Multi Bit - Armory and my bitcoin qt has not been unsynchronized with the blockchain. So my BTC right now is not visible in armory. I want to export the private keys and send them to blockchain or multibit.
I went to armory and i am in advanced mode but only see under 'addresses' : Import Private Key, Sweep Private Key.
To get to the actual private keys, you have to go to "Backup Individual Keys" and copy either the "PrivHex(BE)" or "PrivBase58" fields into blockchain.info.