I'm using Sketch 3 to make a horizontal subtraction composed by four ovals out of a rectangle. See images:
Problem is though that the rectangle is still in "one piece". I can't simply delete the upper part half of it, something I'm used to do previously with Illustrator. Here instead I get some sort of masking between the objects. But I don't want my ovals to mask the rectangle, I want the ovals to use as a cookie cutter to cut out what I want to keep from the rectangle.
How do I go about to make a complete trimming of the rectangle using the ovals so that everything is discarded except the lower wave form object?