Merge Two Objects without Applying Subsurf to Both I have two objects, one with a Subdivision surface object modifier, and one without. However, when I join them with Ctrl + J, the Subdivision surface modifier now affects both objects (not what I want).

Is there a way to join two objects with only the intended object being subject to a Subdivision surface object modifier?
Select the mesh with the Subdivision Surface modifier. In the Properties panel > Object modifiers tab > Subdivision Surface modifier, make sure the View: and Render: values are equal. Click the Apply button. The modifier should disappear from the stack. Now select one, then the other, then key Ctrl + J to join them.