excel函数公式，多个条件串联起来就出错了。求指点

=IF(U4="白关卡航普快",IF(T4<=100,AB4,IF(T4<=110,AB5,IF(T4<=120,AB6,IF(T4<=130,AB7,IF(T4<=140,AB8,IF(T4<=150,AB9,IF(T4<=160,AB10,IF(T4<=170,AB11,IF(T4<=180,AB12,IF(T4<=190,AB13,IF(T4<=200,AB14,IF(T4<=250,AB15,IF(T4<=300,AB16,IF(T4<=350,AB17,IF(T4<=400,AB18,IF(T4<=500,AB19,IF(T4<=600,AB20,IF(T4<=800,AB21,IF(T4<=1000,AB22,IF(T4>1000,AB23)))))))))))))))))))),IF(U4="西线单一品名特快",IF(T4<=100,AC4,IF(T4<=110,AC5,IF(T4<=120,AC6,IF(T4<=130,AC7,IF(T4<=140,AC8,IF(T4<=150,AC9,IF(T4<=160,AC10,IF(T4<=170,AC11,IF(T4<=180,AC12,IF(T4<=190,AC13,IF(T4<=200,AC14,IF(T4<=250,AC15,IF(T4<=300,AC16,IF(T4<=350,AC17,IF(T4<=400,AC18,IF(T4<=500,AC19,IF(T4<=600,AC20,IF(T4<=800,AC21,IF(T4<=1000,AC22,IF(T4>1000,AC23)))))))))))))))))))))),IF(U4="北疆特快散货-百货",IF(T4<=100,AE4,IF(T4<=110,AE5,IF(T4<=120,AE6,IF(T4<=130,AE7,IF(T4<=140,AE8,IF(T4<=150,AE9,IF(T4<=160,AE10,IF(T4<=170,AE11,IF(T4<=180,AE12,IF(T4<=190,AE13,IF(T4<=200,AE14,IF(T4<=250,AE15,IF(T4<=300,AE16,IF(T4<=350,AE17,IF(T4<=400,AE18,IF(T4<=600,AE19,IF(T4<=800,AE20,IF(T4<=1000,AE21,IF(T4>1000,AE22)))))))))))))))))))),IF(U4="北疆特快散货-服装",IF(T4<=100,AG4,IF(T4<=110,AG5,IF(T4<=120,AG6,IF(T4<=130,AG7,IF(T4<=140,AG8,IF(T4<=150,AG9,IF(T4<=160,AG10,IF(T4<=170,AG11,IF(T4<=180,AG12,IF(T4<=190,AG13,IF(T4<=200,AG14,IF(T4<=250,AG15,IF(T4<=300,AG16,IF(T4<=350,AG17,IF(T4<=400,AG18,IF(T4>400,AG19))))))))))))))))),IF(U4="普快散货-百货",IF(T4<=100,AI4,IF(T4<=110,AI5,IF(T4<=120,AI6,IF(T4<=130,AI7,IF(T4<=140,AI8,IF(T4<=150,AI9,IF(T4<=160,AI10,IF(T4<=170,AI11,IF(T4<=180,AI12,IF(T4<=190,AI13,IF(T4<=200,AI14,IF(T4<=250,AI15,IF(T4<=300,AI16,IF(T4<=350,AI17,IF(T4<=400,AI18,IF(T4<=600,AI19,IF(T4<=800,AI20,IF(T4<=1000,AI21,IF(T4>1000,AI22)))))))))))))))))))),IF(U4="普快散货-服装",IF(T4<=100,AK4,IF(T4<=110,AK5,IF(T4<=120,AK6,IF(T4<=130,AK7,IF(T4<=140,AK8,IF(T4<=150,AK9,IF(T4<=160,AK10,IF(T4<=170,AK11,IF(T4<=180,AK12,IF(T4<=190,AK13,IF(T4<=200,AK14,IF(T4<=250,AK15,IF(T4<=300,AK16,IF(T4<=350,AK17,IF(T4<=400,AK18,IF(T4>400,AK19))))))))))))))))),IF(U4="一带一路小百拼柜",IF(T4<=100,AM4,IF(T4<=110,AM5,IF(T4<=120,AM6,IF(T4<=130,AM7,IF(T4<=140,AM8,IF(T4<=150,AM9,IF(T4<=160,AM10,IF(T4<=170,AM11,IF(T4<=180,AM12,IF(T4<=190,AM13,IF(T4<=200,AM14,IF(T4<=250,AM15,IF(T4<=300,AM16,IF(T4<=350,AM17,IF(T4<=400,AM18,IF(T4<=500,AM19,IF(T4<=600,AM20,IF(T4<=800,AM21,IF(T4<=1000,AM22,IF(T4>1000,AM23))))))))))))))))))))),IF(U4="玩具专线",IF(T4<=120,AO4,IF(T4<=130,AO5,IF(T4<=140,AO6,IF(T4<=150,AO7,IF(T4<=160,AO8,IF(T4<=170,AO9,IF(T4<=180,AO10,IF(T4<=190,AO11,IF(T4<=200,AO12,IF(T4>200,AO13)))))))))))