If all your files is in single directory, just use:

paste * | column -s $'\t' -t

If you have a list file contains all files, and each file name in one line, does not have special characters like space, you can try:

paste $(printf "%s " $(cat list)) | column -s $'\t' -t

Updated

With your updated information, you can try:

paste */PQR/A/sum | column -s $'\t' -t

If all your files is in single directory, just use:

paste * | column -s $'\t' -t

If you have a list file contains all files, and each file name in one line, does not have special characters like space, you can try:

paste $(printf "%s " $(cat list)) | column -s $'\t' -t

Updated

With your updated information, you can try:

paste */PQR/A/sum | column -s $'\t' -t

If your parent directory contains many files and directory that you don't need, you must list all your directory explicitly:

paste {1MUI,2QHK,2RKF,...}/PQR/A/sum | column -s $'\t' -t

If all your files is in single directory, just use:

paste * | column -s $'\t' -t

If you have a list file contains all files, and each file name in one line, does not have special characters like space, you can try:

paste $(printf "%s " $(cat list)) | column -s $'\t' -t

If all your files is in single directory, just use:

paste * | column -s $'\t' -t

If you have a list file contains all files, and each file name in one line, does not have special characters like space, you can try:

paste $(printf "%s " $(cat list)) | column -s $'\t' -t

Updated

With your updated information, you can try:

paste */PQR/A/sum | column -s $'\t' -t