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Lt. Commander
Join Date: Dec 2007
Posts: 120
# 2
12-06-2010, 02:45 PM
You can actually stack boxes horizontally in the story editor. Just grab a box and drag it next to another one.

You'll need to complete all the tasks along the resulting row before you can move on in the mission, so I think it's exactly what you're looking for. You can also create multiple strings of parallel tasks, if you wanted.