merge copybooks issue

I was trying to use merge copybooks feature. we have single copy book several segments that starts with 01 and there is no common fields between segments. Here I have two issues.
a. I divided my single copy book to 5 copybooks. I have used merge copybook feature .option("copybook", s"/user/cobtest/test_A.txt,/user/cobtest/test_B.txt,/user/cobtest/test_C.txt,/user/cobtest/test_D.txt,/user/cobtest/test_E.txt") and these files are present in the hdfs at this path. I am getting the error message that the copybook /user/cobtest/test_A.txt,/user/cobtest/test_B.txt,/user/cobtest/test_C.txt,/user/cobtest/test_D.txt,/user/cobtest/test_E.txt does not exist.

b. I have several segments that starts with 01 in a single copy book. May be 30 to 40. Does cobrix has any option to divide them into different copybooks automated.