I want to build an app that will prompt the user to select a file.

the file is on our network. I have set a resource for the root folder and set this resource as a parameter in my workbench. (It would be nice if the user could not change this) The first required prompt (parameter will allow the user to select 1 subfolder of the resource folder. Then i have specific values for 2 other subfolders that will be supplied and added to the root and the first selection. The second prompt will be a single file in the now complete folder structure.

This folder will then be supplied to the output where the file will be written with the same name + datestamp.

I have what i think are the parameters built in my workbench but don't get the path built correctly.

I am trying to buld the path like this.

$(FME_SHAREDRESOURCE_DATA)$(SELECT_PROJECT_ROOT_FOLDER)\\PROJECT_DATA\\WORKING\\$(SELECT_PROJECT_FILE)

any ideas on how to accomplish this?