"Maintaining my O-A visa and having a business visa for Cambodia, Possible?

Hello,

I converted my Marriage visa to a retirement visa last year. My extension is good until Dec 2014. I want spent most or half my time in Cambodia on a Cambodia Biz visa. My Thai daughter lives in BKK and I want to be able to visit her as often as possible and maintain my O-A extension with her/our address in BKK. Is this possible? Any advice would be much appreciated.

I have also heard that if i go out of Thailand on my first extension before it expires i will get my second year extension automatically upon re-entering ( with a re-entry permit) Thailand?

Regards....