Start typing from left hand side? (Within Cell)

Is there any ways to make it so when you start typing, the numbers start from the left hand side of your custom format?

Basically I want to make a cell that has a job number, but I want it to be able to have a total of 5 changeable numbers.

I want the last one to be unnecessary, so I can make a job number that goes up above 99, but only shows itself after I have past that threshold.

IE.)

Custom Format is

00-00#

If I type 0101 it shows

01-01

which leaves the last value blank.