Bonjour, mon ami!  I am familiar with your question.  You may be sad to know there is not a one click answer to your problem, but there is a way to do what you ask.  First, enter the edit mode, and go to select a face on the part of object you wish to select all faces.  Second, once you have one face in selection, you can press the L hotkey.  This will then select all faces automatic of just that part of the object connected to the first face you picked.  This is, in end, same as your wish of the feature in 3dsmax, but with one click in addition, which may not please you, but should not slow you down.

Have fun learning the Blender!  You will find it to be more than capable of doing everything you do at work in 3dsmax.  It may take more than the click of button you are used, to but possibility is in software.