Lightroom 3.2 - How to import duplicate named photos

I am creating one huge photo library in Lightroom and just learned that when it finds a photo named the same as another previously imported, it assumes it is the same photograph, which it is not, and will not allow me to import it. This is because the photos come from different cameras at diffferent dates/times. 

Aside from having to manually re-name all of the photos that are giving duplicate errors, how can I import them. Previously you could find a setting to allow duplicate images, but I can not find that in the latest 3.2 cloud version of Lightroom.

Thanks,

Todd