How to Use a Single Main Folder Parameter While Allowing Different Subfolders for Each Reader in FME Workbench ?

I never use classic readers so I’m not sure how this is done using those, but this is very easy to set up using FeatureReaders. Have you tried that?

Update:

Turns out not to be that hard using classic readers. Steps I followed:

• Create user parameter $(Folder) type Folder.
• Drag file to canvas and configure as needed.
• Remove automatically generated parameter.
• Correct reader source parameter using the created folder parameter to something like $(Folder)\a\test.csv
• Repeat for every reader.

I still prefer the FeatureReaders but it does work fine.

In FME Workbench, I tried to store the file path (without the main folder) in an attribute, and then use feature reader dataset include  a user parameter for the main folder.

My idea was:

• The user parameter defines the main folder path
• The attribute contains the remaining part of the file path (subfolder + file name)
• Then I combine both to read the data

but also does not work in feature reader .i got error 

could u please upload working fme workbench to have a look ,what i did wrong .thanks