The Blend function is fun but effectively that will not done exactly obtain that you want :)

Maybe the SUBD like shown by Burrman is another possible way... :)

Thread about SUBD : https://moi3d.com/forum/index.php?webtag=MOI&msg=9689.1



Several faces can be Subdivided in the same time with the same dimension! (here just 2 faces - Up Down one by one)