I have mapped my yard in overlapping sections, mostly because the GPS drops and makes mapping a large area very frustrating. But I found the added benefit is if something happens and I have to stop the plan, I can create plans for different sections so I don't have to repeat the whole plan and can start in a different section. However when I do this, I have to remap existing/overlapping no go zones, create pathways (even though there is considerable overlap in sections) and new pathways to the charging station if I don't start with the original area. 

Opening up a list with the existing appropriate areas (+pathways & no go zones etc) to pick from would be super helpful, would even be a good place to have a 'deleted' section so that deleted things don't necessarily totally disappear.

Cheers!