How to create an indented transition where two surfaces meet?

[Yechan_Jang]

Hi everyone,
I’m trying to model a shape similar to the image below. Instead of a completely smooth blend between two surfaces, I’d like to create an indented transition — almost like a crease or inward edge — but still with a small radius where they meet (not razor-sharp).

I’ve attached my Rhino file for reference. Could anyone guide me on the best way to achieve this in Rhino?
Any commands, tips, or workflows would be greatly appreciated!

Thank you in advance.

Rounded Corner.3dm (224.8 KB)

[martinsiegrist]

With Grasshopper and Isopod, you could do things like this:

What kind of indent were you thinking of?

Can you share a sketch?