RSS Feed 3.0.1 show sub category items in top cat

Hi you all

how can i change the rss feed so that it shows the products from subcategories?

lats say i have some Category computer///laptops///Lenovo.

how can i make rss show items from Lenovo in the computer category?

it seams pointles to have rss feed if it only works in the last Category (Lenovo)

Best regards