TD1 Form

Hello,

I am starting a new full time job in July and im already working part time right now.  I want to redo my TD1 form at my part time job (1 day a week) to check "More than one employer or payer at the same time” box and leave the credit amount lines blank and enter “0” for your Total Claim amount." and with the full job TD1 form i want to fully claim all amounts because i will be making a lot more. Can I redo my TD1 form and adjust that i have more than one employer on the part time TD1 and my full time TD1 just have it as normal?