Chamfer of a three sided corner. Is it possible?

Hi all.
Please take a look at the chamfer step in the following image:

Is it possible in Rhino to do a chamfer of the corners like it’s done in the image?

If not, how would you do a work around?

Best regards
Esben Oxholm

Not sure if this helps you but there is a fairly extensive thread on a related subject here.

Edit: Sorry after I saw Mark’s post I realized you were looking for something completely different. This script might help. The page requires translation.

Don’t know if this will help, but this is looking familiar, see here Conical extrusion

Hi Guys. Thank you for the answers.
The script does the job I was looking for. Thanks!

The other links was, if not a direct help, interesting reads.

Best regards