As Group Owner or Group Head Admin you can move posts to a new forum. Here is how:
1. While in the post you want to move, click on "move post" in the red admin tabs below the post.
2. Select the forum you want to move the post to.
3. Decide if you want to leave a post on the forum saying the post was moved by clicking the box next to "Leave message with link to new location of post after moved".
4. Click "Move Post" and your post will be moved to the new forum.