Townsie

I have this print, which consists of two objects. The cylinder is separate and is placed exactly on top of the block. I export these two objects as an OBJ file, and pull them into Cura, when I print them - it's treated as if the cylinder is part of one solid model. So when it's printing the top layers, it's leaving a slightly ragged space for the cylinder. What I'd like to have happen is for the top layer to be completely flat, with no hole, and then it'd print the cylinder on top of that. I imagine I can export this as multiple objects, and then import them separately, but I kind of don't want to do that. It doesn't seem very intuitive when I import multiple objects.