Panels are a game mechanic from Portal 2. They can "edit" a Room. Bigger or Smaller, or they can create Stairs or Platforms. The Mapper can use them to change the Rooms like he want.
What we need:
1. Create the prop_dynamic and set the Model "models/anim_wp/room_transform/arm64x64_interior.mdl" and set the Name from the prop_dynamic to e.g. "panel1". And set the "Collision" to "Not Solid".
2. Create a func_brush on the "top side" from the Model. Set the Name to e.g. "panel1_brush". And set the Parent to "panel1".
3. Create a Logic_auto and fire follow Output to the panel1_brush:
OnMapSpawn panel1_brush SetParentAttachmentMaintainOffset panel_attach
Now can the func_brush follow the Animation from the prop_dynamic.
4. Create a logic_relay, or some type of Trigger, set the name e.g. "relay_panel1_animation".
And fire follow Output to the prop_dynamic:
OnTrigger pannel1 SetAnimation ANIMATION_NAME