Select the far right TAB in the 2D interface called MYOBJECTS.
Click on the TAB.
Then make a lasso around objects and then click on the button on the left side called SAVE MY OBJECTS. Select a name and save. This will create a thumbnail on the left side.
This group you can then drag out into new projects.
The group will be "locked" as default. But in the top navigation bar in 2D you will see a button called GROUP. Click on it and the object will be free to move.