I’ve just started learning Zbrush for few weeks, I came up with using the curve to make the hardsurface, but the angle is snapped to 5 degrees in change, I mean it only gives me the angle 5,10,15,20,… how can I adjust this? 
There isn’t any setting for snap angle but, once you have the SliceCurve drawn, you can let go of Ctrl+Shift and change the angle freehand (without snapping) to whatever angle you want.
yeahh that helped, thank youuu