hey back. i just open my dragon and went back. did you go to isoparms and then click on the first middle one on top and then go back and hold shift and select the other one on the bottom ..then edit nurbs and dettach surfaces. You have to do it twice. Then to make sure they are two seperate parts just click on the side you want delete and then only that side will highlight ..then hit delete...that should do it ...

if you have problems just post up your file and I or someone else can take a look at it

also make sure you set detach surfaces to default