How to select large areas without tediously shift click?

So, I was editing a jailbreak map I was working on a long time ago on CounterStrike and couldn’t figure how I would be able to take an area easily without tediously shift clicking through every little object, entity and shape.

Any help is appreciated, thanks.

Select it in 2d view?

Turn on / off the visgroups of the objects you do / don’t want to select. Use a grid with the selection tool and click and drag the area, let go and press enter to select all the things in the selected area.

Thanks a lot man, appreciate the help.