How to delete a portion of a shape

After I import an image into easel, I’d like to be able to delete a portion of a shape. For example, if I have a circle in easel, and I want to just remove a portion (arc) within the circle. Is this possible?
Or (another example), if I have a rectangle shape and I want to remove one side? Can I do that?
Note these examples are simplified just to explain what I want to do with something more complex.

Click object and press “E”.
Click each small node and press “Delete”, continue untill satisfied.

To remove one portion of an object, create an object to substract, set its depth to zero and chose both objects and use “Edit -> Combine”


Excellent. Thanks!