How do I show a specific part of a sprite?

I try to make like a sonar top down game.

So when i shoot with a bullet on a wall, i would like to show only the part of the sprite touched by the bullet. Like if the hit is making a 120x120 pixels on the wall. I want only that 120x120 pixel shown.

Thx

Have a look at layers and blend modes. You can create a sprite the size of the bullet and have it reveal what is behind. You can also use the drawing canvas

what do you mean behind ? which blend mode should i use ? should i make invisible the walls then visible when touched by the sprite ?

construct.net/en/forum/construct-3/how-do-i-8/punch-hole-sprite-reveal-layer-156127

This thread has an example of a similar thing however, it appears that the drawing canvas is doing wacky things now and it isn't working at the moment.