Colour

IoB 515ml mash 3.0 to 7.0 EBC units

EBC mash 3.8 to 9 EBC units

ASBC mash 1.9 to 3.8 Lovibond units

This is just the color you expect. BeerSmith calculates either the EBC method or the ASBC method. I don't think it supports the IoB method.

Extract

L/kg (dwt) IoB 230

EBC % 60

The L/kg weight is the easiest to convert to Specific gravity. The number is telling you how many liters you'get at one gravity point from the grain. In this case, you'd get 230 liters, or alternatively, you'd get one liter at 230 gravity points. Since we base the percentage yield on sucrose, which happens to be 384 L/kg, we just do the division.

Malted Flaked Wheat: 230 L/kg

Sucrose 384 L/kg

230/384 = 0.5989 = 59.89% yield.

That'll convert to about 1.028 SG when you put the percentage into the grain profile.