Variations Availability?

Hi,

For each we have added a “ship to” variations based on customers’ destination, so we can control the availability in each countries (e.g. some product is available in US may not be available in the UK). So when we are submitting feeds, we want to submit only some of these “ship to” variables (e.g. only those in US or UK). The solution I came up is to create multiple feeds of the same catalog, and distinguish them by using the availablity in “ship to” variables. The problem is, I don’t know how to map the availability of variations to the feed. I can find the availability value, but I doubt this value is for Simple products instead of Variations. So how do I map the variations availability to the feed?

Regards,
Gary Zhang