Need formula based on role change month

from attached sheet,

in FTE Cost sheet, values should populate from Jan - Dec based on DOJ (column C) and value should be current Level Annual cost (column F) / 12.

2nd critiria is based on Role change month, value should change based on role change month onwards i .e proposed level annual cost (column H) /12

applied below formula and need to get value based in 2nd critiria also

=IF($C8="","",IF(MONTH($C8)<=VLOOKUP(COLUMN(J$2)-9,{1;2;3;4;5;6;7;8;9;10;11;12},1,0),$F8/12,""))

Thanks for you help.