@Helal asked in Import Multiple CSV Files from different folder, Update Value, and save CSV with different names how to do several things: gather a bunch of CSV files from a directory tree, make edits, and save the files back to their original directory, as CSV, renamed slightly. This JSL will get you started.
Do be careful with the Delete Directory! Don't use it in your code!
// JMP 15 or later required; JMP 14 does not have the recursive MFI option
dir = Convert File Path( "$temp/deletemeCSV/" ); // keep the paths in variables
// Delete Directory( dir ); // CAREFUL!!!!!
Create Directory( dir ); // making dummy data
subdira = Convert File Path( dir || "argyle/" ); // dummy sub dirs
subdirb = Convert File Path( dir || "plaid/" );
Create Directory( subdira );
Create Directory( subdirb );
dt = Open( "$sample_data/big class.jmp" ); // use this for dummy data
dt:name[1] = "katieA"; // make the dummy files distinct
dt << save( subdira || "a.csv" );
dt:name[1] = "katieB";
dt << save( subdirb || "b.csv" );
Close( dt, nosave ); // done with big class
dtlist = // MFI reurns a { list } of data tables, even if only one
Multiple File Import( // I removed a lot of default parameters
<<SET folder=""></SET>
