How to cut imported picture?

Hi, I imported a picture as a ground image and I want to cut image in the red circle, so it shows complete stairs, etc.
Any advice/suggestions on how to work on this problem?

Import the image as a texture and apply the texture to a face with a hole in it.

Or, at the point, explode the image so it becomes a texture. Draw a circle on the face and delete the face inside to leave the hole.

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NVM. I just found the answer: right mouse click on image, then explode