How to fill in/collapse an indented cylinder onto a face I'm new to blender so still figuring things out. I need to basically fill in the cylinder so that it no longer exists. I want to close up the half cylinder on the left, remove the edges in the center, then close up the wall on the right that's currently cut into with the half cylinder indent. I tried deleting vertices and edges, but it seems that no matter what I do it really messes with the design or destroys the face.

Also, are the edges connecting cutouts in my object necessary? Any way to remove them? They seem to complicate making faces.





Thanks!
Are you going to make this a super high resolution mesh later? You're going to want to clean up the faces that have 5 or more sides before you continue to progress. But that's an aside. The main thing you want to do at this point is get rid of that cylindrical shape. What you need to do about that is switch to face select mode, and alt + shift + right click the edge that flows with the shape of the round loop of the cylinder. This should select the entire cylinder. Delete these faces while still in face mode.

Now switch to vertex mode. Select the vertex where the floor of the object and the wall meet at the beginning of the remainder of the cylinder's curve. Make sure your 'pivot point for rotation and scaling' is still set to 'cursor'. Select the remaining vertex points that form the remainder of the cylinder on that side, and merge all of the points to one of the end points. Do the same thing on the other mirrored half of the mesh. Select the vertex.

If you need a more in depth explanation, lemme know.