I wanted to build a perimeter and create a huge city. I did this in admin mode and now I have changed my mind. Is there a way to delete/destroy these walls quicker then going to the foundations an destroying on block set at a time. BTW i am on PS4
The only way I see is setting the decay time to the lowest possible value, then desmolish it.
You could focus on destroying the lower foundations that support the ones above it.