Put the mouse above and to the left of what you want selected then click and hold while you drag mouse down and to the right until you see the dotted box outside of everything you want selected then let go. Everything inside that area will then be selected.

I would suggest before you do this you look for the "create outlines" or one of the other words I mentioned that you will need once everything is selected.

Perhaps one of the other members that has this programme will advise of the term used here.