How contribution funds are alocated

Hi, I received feedback from my CF83 application with 5 years that I can contribute towards. I am living and working abroad. I understand that making payments from abroad, I simply add My NI Number followed by IC and my surname/name. However, I have 5 years with 5 different sums to pay for, how will the money be allocated? Can I just transfer the amount of all 5 and it will cover all, or do I need to transfer the sums individually? When it comes to future years, will I receive a new letter each year regarding the payment? Or when do I know to make future payments Thanks,

Hi 
You will need to contact our National Insurance Team, you can explain to the advisor which tax year/years you are intending to pay for and the advisor will note on your account which tax year/s you are paying for so when the payment comes to us it gets allocated and posted to the correct periods. Please find our contact details below:
National Insurance: general enquiries
Thank you.