Quote Originally Posted by pe1234ter View Post
Regarding availability setting, I have a question

I want to include Zero Quantity item in the feed and availability will be marked as <g:availability>out of stock</g:availability>

I found that only non-zero quantity item have availability included
<g:availability>in stock</g:availability>

However, Zero Quantity item will not create <g:availability>

Can anyone help?

Thanks
If I understand you correctly you want to create "out of stock".

To the best of my knowledge I don't think Google will allow that. Items must be in stock.