As far as having NO crease you just have to make a mask (or use the masking in AS but I have not tried that yet) You place a shape that is all blue (in this case) on top of the top shape to mask it but a tad smaller to allow the black (in this case) edge to still appear. You then bind BOTH upper sha...

Sorry if this has been discovered before. There is more you can do with this and the 'crease' is made with sorting the three shapes. You can make the crease on the other side (IE upper joint in 'front' by simply changing the shapes order. I just thought there "had" to be a simple way to do...