Credits: justin

Steps:

1. Enter Restaurant City > Decorate restaurant
2. Put a Chair on the spot you want the wall decor/door to be.
3. Adjust the side it will face.
4. Go to the Wall decor/door section with the item that you want.
5. Now, drag the chair out of the game window and release the mouse button.
6. Drag the wall decor/door item that you want into the game and release your mouse button. (ignore the chair)
7. The wall decor/door should drop nicely into the position where the chair is at earlier.
8. If it doesnt, try again. Make sure to drag the chair out of the window, then drag the wall item you want into the window. Watch video if you’re still unable to do it.