Lead time calculation for different production Line

Dear All

pls see below data. diffident production line & order demand are mention in below & Line capacity also.
need to calculate the date target date for pending & future orders. only can run 3 lines per day.
pls help. also one file attached

Product Line Back Orders 10-Mar-13
AA 894
BB 2083
CC 2969 74
DD 112
EE 456 103


Line Capacity Pcs
AA 253
BB 248
CC 141
DD 154
EE 210