Computer case modelling

We aregoing to create some holes for the second fan. Select the polygon where youwant to make the holes for the fan and click a few times on the tessellatebutton. This will add some more polygons.

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Now select the polygons that you want to be the holes and delete them.After that select all the borders of the deleted polygons and shift + drag themback. This should be the result:

Do the same one more time to create more holes for the ventilation of the case.