Hi sayd,

>>>I attached a pic where you can see what i mean.

I had not seen that detail on the pics, so sorry for my confusion.

You will need to create a separate part for that, as you have already boolean out that ear piece.

There are different ways to construct the grid, by either creating a solid shape then boolean out the holes, or by creating the cross sections and boolean them together, or you could even draw the full shape (with holes) and then extrude.

I decided to make the cross sections out of long cubes, I made 2 that crossed each other, then made straight array (which made the needed copies), then boolean together.