Nov 22 2018 12:13 AM
Nov 22 2018 12:56 AM
I do not think this is possible with cell formatting as this option only deals how your value is being shown not the value it self. However you can add a helper column and create a formula like this (assuming your numbers are located in column A):
="0031" &A1
to convert your number to a string starting with 0031. If you need this to be a number then you can try below formula:
=("31&A1)*1
however this time you need to change cell formatting to show this number as desired.