How can specific lines be deleted in an easel drawing?
Try the exploder app.
Or cover them with a zero depth element.
You can try double-clicking on the object. This should show all of the points that make up an object. You can then delete what you do not need to move them to suit your needs. Also, while you are in this type of operation you can hold down the Alt key while moving a point to disable the snap-to-grid feature; releasing the Alt key automatically resets it.
Thanks for the excellent suggestion. Problem solved.