The split and aggregate tools allows you to perform a cut and add on to the polygon at the same time.
Shortcut: CTRL + A
To use the Clip and Aggregate tool, follow the steps outlined below:
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Click the Open Transformations button on the Mapping tab.
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Select the polygon to clip and aggregate
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Select the Clip and Aggregate tool
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Draw a line across the polygon where you want the cut to be and where the new polygon added.
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Double left click to finish drawing.
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Click Save