Land cover separation

Hi! I’ve been struggling to separate land cover data into layers in global mapper. I’ve connected to the CORINE WMS, but it just loads as one single raster. Since these areas are already classified, I would have thought that I could work with each classification separately, but there dont seems to be any classifications except colors on the downloaded data. I would be very happy if someone could point me in the direction of a place where i can download separated data. I’ve been struggling with this for days, but I just cant do it…