How do I apply cement to stack 3 high cinder blocks?

Tor9126523
by Tor9126523

I have 10 vintage windows and want to put them on top of (three high) cinder blocks, I want to put wooden beams into the open square of the cinder block and fill it with cement? How do I put cement on each layer (3) to hold them together? Like frosting a cake?🤔

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