This window allows you to initialize the forced induction (boost) parts of the fuel & ignition tables.
Only boost columns are altered (columns 11 upwards).
Ignition tables
Don't change - doesn't alter the ignition table.
Initialize to lowest normal advance - copies the highest naturally aspirated ignition column into all the boost portion columns of the ignition tables.
Retard ignition - as above but retards the ignition based on specified retard value (degrees per pound boost).
Fuel tables
Don't change - doesn't alter the fuel table.
Initialize to highest normal fuel value - copies the highest naturally aspirated fuel column into all the boost portion columns of the fuel tables.
Add fuel under boost - as above but adds fuel in proportion to the increase in manifold pressure over atmospheric pressure. To allow for the lower BSFC for forced induction it is normal to add for fuel than the absolute increase in pressure would suggest.