Normally done with welded or bolted structural steel outer frame for the door to reinforce the opening you are making then normal door put inside that outer frame and commonly adding reinforcing and or grout filling of the block voids on the blocks surrounding the door opening.
How to install a steel door in a concrete block wall.
How to replace a metal door frame in a cinderblock wall.
When placing a door in an opening these doors must be fastened to the base material that is present in this location.
Most frequently this base material will be concrete brick or block and will require the use of special concrete fasteners door frames may range from solid wood to hollow steel.
With the intended position of the lintel marked on the wall carefully use an angle grinder or masonry saw to cut away the mortar.
Cutting through a block wall but not the concrete footer would.
Place a level against the hinge side of the frame to verify whether it is exactly plumb.
To install a door in a concrete block wall you ll need to first create an opening for the door.
Steel lintels in concrete block walls are placed in the mortar between blocks so the first step will be opening a space for the lintel itself.
Insert the shims at the top of the door behind the topmost hinge.
If not slide shims between the concrete wall and the frame.
These blocks are durable and easy to install but can be difficult to modify or remove.