How does one extend a mesh?

[Kanika_Rajain]

Attached a fig. for your reference.

[wim (Wim Dekeyser)]

Hi Kanika -

@Kanika_Rajain

Attached a fig. for your reference.

I’m afraid that figure doesn’t clarify the question much.
What have you tried that is not working? Why is there a python tag on this thread? Can you post a 3dm file?
-wim

[Kanika_Rajain]

I did it this way. Extracting the edges of mesh and then extruding it.