The Final Boost Target table takes the incoming boost target from the boost target table, partial throttle boost target, or boost by gear target limit and processes it to a final value. As you can see it is nearly one to one.
A second feature of this table is limited the maximum target that can be achieved. As you can see in this example table 22 is the maximum the table allows as a target boost pressure and will target 22.5 as a maximum. In order to target higher pressures you'll need to change both the final column header for TBST (Target Boost) and the entire column of targets for that pressure.