def demo_trimFeatures_add(rootComp: adsk.fusion.Component):
tool = _ui.selectEntity('Select trimming tool', 'SketchCurves').entity
trimFeatures = rootComp.features.trimFeatures
input = trimFeatures.createInput(tool)
# Arbitrarily choose the first cell to trim.
cells = input.bRepCells
cells[0].isSelected = True
# Create the feature.
trimFeatures.add(input)