The Block Hacking step is only visible if it has been enabled in Configuration Options > Reserves Hacking
Block Hacking allows the user to select one or more blocks and manually override the database values. This feature is directed at short term planners where direct inputs from geology and/or survey have not made it to the block model.
Note, this is directly editing the reserves values that Tactical Scheulder will then use for Scheduling. This should be used with care.
Setup > Block Hacking > Choose Records > edit reserves