BJT Transistors - On Characteristics
It means (100mA case) that if you drive the transistor such that the Vce is 1.0V and the IC is 100mA, the required base current will reflect the stated hFE range.

Imagine an 11.0V supply voltage, a 10 ohm resistor to the collector, emitter grounded. 

You apply increasing base current until you see Vce drop to exactly 1V.

Then hFE is Ic/Ib = 0.1A/Ib.