The mod «WorldEdit (World Editor)» is a somewhat limited World Editor for Minecraft Bedrock compared to its Java Edition counterpart. It introduces 11 commands that will significantly simplify your building process. For instance, with just one simple command, you can fill the nearby area with water, while another command allows you to create a path leading down to a mine in Minecraft right beneath you!
Commands
/function clear-100 This command clears all blocks within a radius of 100 blocks on each side and 50 blocks deep from where you are standing. It’s an excellent way to clean up forested areas.
/function level-100 The ground level will be filled below your feet for 100 blocks in every direction. This is perfect for leveling uneven terrain.
/function drain This drains all water in holes by 10 blocks in each direction.
/function mine Create a pathway down to the mine at 69 blocks depth.
/function mine-rail Construct a railway descending down to 69 blocks.
/function subway-n Build a subway line heading north for 100 blocks.
/function subway-s Build a subway line heading south for 100 blocks.
/function subway-e Build a subway line heading east for 100 blocks.
/function subway-w Build a subway line heading west for 100 blocks.
/function fence-10 Create a fence around yourself within a radius of 10 blocks.
/function fence-20 Create a fence around yourself within a radius of 20 blocks.