So i created a circle in world edit but its is in the ocean, is there any way to clear the water from inside the circle ?

I want to create an abyss with the two mods, but unfortunately I can't go below 0 in the vertical direction. The Cubic Chunk mod makes it so that you have more blocks under 0, giving you the ability to create exciting adventure maps. Can someone help me? Is it possible to go under 0 with WorldEdit?

Im trying to find what command it is or its only whit the mod?

there is a way to use worldedit commands with command blocks?

I've been trying to get to replace a percentage but can't figure it out. Can anyone help? I've been trying to figure it out for 20 minutes now and can't find anything.

Is there a way to select a specific block? For example I have a brick outline that is in the floor, would there be a way to just select the brick and //stack it? Without stacking the floor along with it.