I found this.
Sheet metal parts are created by first defining or selecting a sheet metal style and then creating a basic sketch for the sheet metal part using the sketching tools. The Face tool is the primary means of converting the sketch into a sheet metal face. Faces can be offset, cut, bent, chamfered, and rounded. The Flange tool lets you create flanges automatically. The Hole tool is for drilling holes into the part, while the Flat Pattern tool can be used to unfold the part into a flat pattern.