=IFS(
MATCH(A1,[MaterialBase.xlsx]Sheet1!$C:$C,FALSE),INDEX('E:\Unity\CTT\Tools\ExcelTool\Excel\[MaterialBase.xlsx]Sheet1'!$B:$B,MATCH(A1,'E:\Unity\CTT\Tools\ExcelTool\Excel\[MaterialBase.xlsx]Sheet1'!$C:$C,FALSE)),
MATCH(A1,[GoodsBase.xlsx]Sheet1!$C:$C,FALSE),INDEX('E:\Unity\CTT\Tools\ExcelTool\Excel\[GoodsBase.xlsx]Sheet1'!$B:$B,MATCH(A1,'E:\Unity\CTT\Tools\ExcelTool\Excel\[GoodsBase.xlsx]Sheet1'!$C:$C,FALSE)),
MATCH(A1,[EquipBase.xlsx]Sheet1!$C:$C,FALSE),INDEX('E:\Unity\CTT\Tools\ExcelTool\Excel\[EquipBase.xlsx]Sheet1'!$B:$B,MATCH(A1,'E:\Unity\CTT\Tools\ExcelTool\Excel\[EquipBase.xlsx]Sheet1'!$C:$C,FALSE)))