When you finish the data entry in GTP, please refer to the instruction sheet that prints with your tax return or forms. The documents that you must send with your tax return depend on your particular situation. The GTP instruction sheet will list each form or document that must be attached and how/where to attach the form or document.
If you do not attach the forms or documents that are required to be attached to your tax return, the IRS will likely reject your entire tax return. In such case, you will then be required to write a letter explaining that you failed to submit the necessary documents with your original tax return and then attaching the documents.