I use PlanBuild. It is newer than Build share and can also use blueprints from both mods. It allows you to flatten areas from hoe size up to several football fields size. You can remove buildings and vegetation. It also allows you to copy buildings from other servers or download some from web (i know only Valheimians web page, but there could be more). Copied buildings can be pasted with infinite health to preserve buildings if you are going to have some kind of events there.