低版本啊,那就堆吧

=IFERRO(A&LEFT(MID(I2,FIND("_",I2)+1,LEN(I2)),FIND("_",MID(I2,FIND("_",I2)+1,LEN(I2)))-1)&"_B"&MID(MID(I2,FIND("_",I2)+1,LEN(I2)),FIND("_",MID(I2,FIND("_",I2)+1,LEN(I2)))+1,FIND("_",MID(I2,FIND("_",I2)+1,LEN(I2)),FIND("_",MID(I2,FIND("_",I2)+1,LEN(I2)))+1)-FIND("_",MID(I2,FIND("_",I2)+1,LEN(I2)))-1)&"_C"&MID(MID(I2,FIND("_",I2)+1,LEN(I2)),FIND("_",MID(I2,FIND("_",I2)+1,LEN(I2)),FIND("_",MID(I2,FIND("_",I2)+1,LEN(I2)))+1)+1,LEN(I2)),"")
