I am very tired of trying! I liked to build a simple hollow cube with snap hook fastening. I did it in this way:
1- drawing a rectangle sketch
2- extruded boss/base it
3- using shell command
4-mirror it by a reference plane
5- try to add snap hook and snap hook groove, but I can't add snap hook groove!
It gives me an error ... How should I build a hollow cube with snap hook fastening step by step?