New Aperture user needs a little help

I just converted from LR to Aperture.

Right now I am at the process of importing my entire photo library into the Aperture Library.
All photos stay at their location and no duplicates are being created.

Question:

How can I select a drive or a folder and have Aperture scan and import all photos within this location INCLUDING ALL SUBFOLDERS?

Since I have hundreds of subfolders, this could become a daunting task, if I had to select and import each subfolder individually.

This setting is available in LR, so I am guessing that it should also be part of Aperture, but I cannot find it.

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Andrzej
http://lowflyingbananas.zenfolio.com/