create flat faced edge im relatively new to using blender and i was wondering if anyone could help me find the quickest way to create a flat face on an odd angle with more than 3 vertexes. Here is an example of what im looking to achieve. (This was done by putting a cube up to the corner and using Boolean to delete the corner) any help would be awesome :D
You can use the Mesh > Bisect operation for this.

Just look from the side angle you want to cut from, draw a line over your geometry with LClick+Drag, and release.



There are some settings in the Operator Panel. Enable Fill and Clear Outer to get the cut to produce a face like in the GIF above.