Csv Import Of Products Features As Brand


I am trying to following, but it does not work.

I managed to import a csv file in the administration->import data section.

I am using 'Features' for the brand.

Now when I want to make a filter, i go to catalog->product filters->add filter

Then I go to filter by- and i only see filter by price, stock and no sendcosts.

How do I filter by features ???

Please help


Do you have the options visible in your products in the options tab?