Upside down and need to sell PLEASE HELP ME

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Hello,
I have a SFH, two duplexes, and a triplex in Greenville SC area, and I'm working with a negative cash flow and I probably owe more than they're worth. I have no cash.
1) Can I owner finance a new buyer and continue to pay the existing mortgage monthly, or must I pay that off to do that?
2) Can I sell the notes to a private buyer, have him pay off the mortgages, and pay the noteholder the difference monthly on a private note between us?

OTHER IDEAS? HELP!