You can only upload a piece of work to one group at a time, and there is a 2 day waiting period between uploads, so if you want to upload it in another group you'll need to make a copy, wait 2 days, and then upload it.
Alternatively, you can post a link to the work you've posted in one of the groups, in the topic section of each group and ask for feedback. You can also post a link in the Introduce Your Work forum asking for feedback.
The Site works best with reciprocal feedback, so you are likely to get more critiques if you have posted feedback on work uploaded by your fellow Group members in the Groups where you are posting work. (sorry for the tongue twister.
)
As for posting re-drafts, yes, you can - although not everyone will crit a redraft (if they feel they'll just be repeating themselves), so don't be surprised if you get fewer crits.
- NaomiM