Selecting an object with in a circle

Im having issues selecting an object with in an object.

Say you have a box and inside that box you have a few items you want to move. I have issues selecting the batch of items inside the box, it keeps selecting the box also. On some other programs I can old control and click on something thats been selected so it gets unselected and vice versa, is there a short cut key i can use etc?


Shift-Ctrl on Windows
Shift-Cmd on Mac

will allow selection of multiple items.