Figured out that answer to my question. Saw a link to a different Yeast calculator.
This calculator lets you enter the starting amount of yeast, and calculates the total you have based on the volume of your starter.
Alot of the other yeast calculators just go from the assumption that you use a fresh pack or vial and calculate based on ~100B cells.
Using the new calculator I can do the following.
If I draw 10ml of fresh yeast from the vial I should have about 20 Billion cells.
That is what I enter as my initial cell count.
then the 1st step will be a .5 Liter starter which will bring the count to 68 Billion.
Finally a 2nd step will be a 1.5 Liter starter which brings me to 224 Billion.
Basically I can now stretch a single Whitelab vial to 3 different brews without having to buy a new vial each time.