How to get only directory names(not files) of Al11 as f4 help in one parameter and presentation server as f4 help in another parameter.

i got the requirement to download data from app to presentation and upload from pres to app server.

    So i have two radio buttons Download and upload.In first block I need to get all directory names of AL11(not files) in one parameter  as f4 help

    and in other parameter i need to get the files of selected Directory as f4 help.

    In Second block i need to get all directory names of presentation server(not files) in another parameter as f4 help

and in other parameter i need to get files of selected directory as f4 help.

Problem is iam unable to get only directories from AL11 or Presentation server in one parameter. I am getting all directories,path and filename in single parameter with f4_dxfile_recursion or /SAPDMC/LSM_F4_SERVER_FILE or
  CALL METHOD cl_rsan_ut_files=>f4.

I should be able to download and upload multiple files.

.I also attached selection screen copy.