I am looking for a forum that can help me with AutoCAD Plant 3D 2016

Visit the AutoDesk website and you should find what you are looking for in the Discussion Groups.

i think should google your topic

Here are links to AutoCAD Plant 3D forums.http://forums.autodesk.com/t5/autocad-plant-3d-general/bd-p/371http://www.davetyner.com/forum/forum/autodesk-plant-design-suite/autocad-plant-3dhttp://forums.augi.com/forumdisplay.php?1297-AutoCAD-Plant-3D-Support