Go to the BP_WoodDoor and create a new variable called OpenDoorSound and set its type to SoundBase and tick Instance Editable on.

Create a new variable called CloseDoorSound and set its type to SoundBase and tick Instance Editable on.

Add the highlighted nodes shown in the image below, location at the top of the image.

Now do the exact same things but in the BP_BasicDoor as well.