Check for any pipes that may be installed in the concrete wall which can be damaged from the cabinet installation in your chosen location. If none are found, make a line on the wall using chalk to mark the placement of the bottom of the cabinet. Mark it using a carpenter's level.
Drill holes through the rear of the cabinet using a 3/16-inch drill bit.
Place the cabinet against the wall, propping it in place using T-braces placed beneath the cabinet to hold it up at the level of the marked line, one placed at the rear of the cabinet and another at the front. A helper can aid greatly in keeping the cabinet steady.
Drill starter holes into the block wall using a hammer drill through the 3/16-inch holes. Remove the cabinet and complete the holes, drilling through the wall surface into the cavity of the block.
Place the toggle bolts through the cabinet and then place wood shims onto the toggle bolts between the cabinet and the wall in order to level and plumb the cabinets.
Place the cabinet back onto the T-braces and screw the toggle bolts into the drilled holes to hold the cabinet securely. The toggle bolts have an anchor part in the wall that opens to the rear of the block as the screw is tightened, holding the screw in place.