Create cut from the wall exactly 0.3m in I have a 3d plane as the floor that's an odd shape.
I'm trying to create walls in from the side of exactly 0.3m.
Attempt 1 Use knife tool. This works but don't know how to set in from the edge exactly.
Attempt 2: Duplicate vertices, and just the override tool to set exactly.
Selected two outer vertices and duplicated, pressed x to move the vertices in and manually overrode them to be 0.3m in. This creates a separated edge from the original model. So I can't select a face to extrude.
Can someone point me in the right direction of how to do create a cut in from the edge of specific size? Thanks
The fastest way seems to be the Bevel tool.

Select the starting edge and Bevel it
Set Segments = 2, Profile = 1
Adjust offset value to your 0,3 meters

Note: This will also create two double verts. Select All and go Mesh &gt; Clean Up &gt; Merge by distance.