Now that it has a symmetry modifier, you need to collapse the stack so that the two halves join together permanently. The reason we do this is because the dashboard is not perfectly symmetrical, there is a steering wheel on one side. To do this, right-click the symmetry modifier in the stack and select "Collapse To" from the menu. You will get a little warning but ignore it and click on the button labeled "Yes."
Cut the edges shown in green on the right side of the car. You can use the "Connect" or "QuickSlice" tools to make it faster for you.
Create a cylinder and position it in the dashboard as shown. Squash it down on the z-axis a little. Convert it to a poly.
Select the polys shown and scale them up as shown.
Extrude the polys inwards a couple of times as shown.