One year multiply entry visa. Is this the way it's done? Thanks

Tick the box that says 'Business' on the visa form (instead of 'Tourist'), pay $25 instead of $20, you get a 30 day business visa. Go to any one of dozens of visa agents in Phnom Penh, pay the going rate (about $260-280), and ask for a one-year extension of business visa. Takes a couple days, it will automatically be multiple-entry, and the process is hassle-free. Repeat as needed. No need to exit Cambodia, no need to report every 90 days, no need to ever SEE Immigration. Ever.

Close enough - though I paid 300 for the extension about 2 months ago.

Yes this is the way its done here, I paid $285 eight months ago (gave my passport to someone else to organise the extension), I have been to Thailand once since and you just sail through back into Cambodia, mutiple entry.

I will renew it in February.

No documents needed for the business visa, no immigration reporting, just sit back and enjoy the sun, $0.75 beer and easy life.

yup.