1095A

I can no longer claim my son as a dependent, but he is on my 1095A.  He filed his own return.  There is a way on Turbo Tax to divide the shared policy, but I cannot figure out the percentages.  Instructions say that between the two returns, mine and my sons, it must be 100%.  So, if I am claiming 60% do I put 30% in both Premium Percentage and Advanced Payment of PTC Percentage which would equal 60%?  Then my son would claim 40% putting 20% in both Premium Percentage and Advanced Payment of PTC Percentage which would equal 40%?  Thank you.