If you mean the parts like the one starting around...
...I think you want a synth pad.This seems like a nice tutorial just to get the concept of pads:
But, I think you can find plugins for pads that are preset with that kind of "sweeping" sound, you don't necessarily need to create your own. Some pads put most of the sweep in the initial sustain then hold one tone, others continuously sweep. You might need to try out several before finding one you like.