Yes, you can move more than one post at a time, here's how:
1. Go to your groups homepage.
2. Click on 'Manage Forum' from the 'More Admin Tools' link.
3. Click on 'Move Posts' beside the forum you want to move posts from.
4. Click the box next to each post you want to move.
5. Click on 'Move Selected Posts'.
6. Choose which forum to move posts to in the pop-up screen.
7. Click 'Move Posts'.