Is there a way of attaching a Chatter post to the feed of a record, e.g., a case, after it has been created already with a different parent. Here is an illustration: If a work buddy has raised a case and had it resolved only to find out that they need to ask another question about the same issue, is it possible for the post to be attached to the feed of the case it relates to. I know that technically the user would normally have to go to the record and then post, but is it possible for them to post and then attach to the record?
EDITED response: Upon clarification in the comments, the answer to your question is no, it is not possible to change the parent record associated with a Chatter FeedItem. FeedItem is not an updatable sObject, they can only be created and deleted.