I’m sorry you are having trouble with SmartOffice 2 functionality.
If I understand your question, you are trying to transfer a group of documents from your PC to your mobile device. The best way to access a large body of files from your device would be to move them (or copy them) from your PC to a cloud storage location (such as Dropbox, Box or Google Drive).
You are correct that the SmartOffice Explorer (file manager) can take action on only one document at a time.
If I misunderstood your question and the 200 documents are on your mobile device and you want to transfer them to your PC, your best solution would be to use the backup feature of iTunes to copy files from device to computer.