I want to know whether there can be system where we can just erase a portion of the content.. suppose I want to erase a part of a circle, but the whole circle is erased. Can you please help me in this

Hello! Thanks for your question. That is not currently an option, but one that we do have on our list of features to explore adding at some point. In the meantime, you can use the new Compass tool to draw parts of circles. You can find that under "Utensils" in the geometry section. I hope this helps!