I am trying to have a movable subtractive brush in game, which is visible for the player to move around all axis exactly like in Editor mode for the player to move around an environment.
If anyone can help me with this, please could you show a blueprint layout ?
Unfortunately this is not a possibility at this time. To be able to mimic this, you will have to set the model that you can pass through up in a 3d modelling program and manually adjust the objects in your level accordingly.