I have a mansry block residence. I wish to install a window in the
middle of an outside wall. Are there any construction details
available which explain how to modify/hold the blocks above the
cut-out so that the wall remains structurally sound? In new
construction the course of blocks abour a window opening are filled
with concrete and a reinforcing steel rebar. I do not know of any way
to do that at this time. thanks for any assistance.

This looks like a repeat question