You can only binary a single file in. In your QVW load script, modify the script to save the exports as qvd files instead of a qvw. Then in the secord file you can load the qvd files and merge them as needed. Here is an example.
In Source file
STORE Table_Name into C:\Data\Table_Name.qvd (qvd);
In Destination file
Once the load is done, save the file as a qvw. This will bring all of your data into a single file.