hi thereive done a inventor course but only on parts and assemblies i am now trying to create parts for sheet metal at work and just wondered if anyone had any advice or help at work we fold panels so one fits inside the other and not corner to corner i.e if panels are 1.2mm thick we offset the y flange  by a thickness +.5mm so theres only a 0.5mm gap. i am struggling to achieve this. any ideas thanks