But this will not allow me to calculate with the the numbers with zeros infront. I need to add 00 so the numbers change.
Not sure I understand. If I multiply the formatted numbers by 2, it generates a number and if I format them the same as the cells holding the two zeros, I get the result with two zeros preceding.

v A B C
1 001234 002468

v A B C
1 1234 =A1*2