I would like to know if it is possible to use the inset function while keeping part of the shape intact.

[![](https://i.stack.imgur.com/ErgQ4.png)](https://i.stack.imgur.com/ErgQ4.png)

Circled is the part I don't want insetted, and I tried to show a global idea of what's the result I want to get with this. This knife/sword edge is one use case I can think of, but that would also be useful when insetting at the border of a mirrored object, to inset the global shape instead of just the half you're modifying.