I want to create 3 sliding doors. The first set has (2) doors, sliding opposite directions, like @ a mall. The other one is just sliding in 1 direction. So, I click on each induvidual door, tie to entity, func_door, and then set the correct pitch (180 for (1) door, and (0) for the other for left and right sliding), I add opening sounds. After I close the Object Properties window, if I goto edit>properties, it shows nothing, like I never tied it to an entity.

(also): I want the doors to open when you walk up to them, no pressing "use", and then I want them to shut after 5-6 seconds. What options will I need to set to achieve this? Thanks alot in advance.