Here are the help articles:

IMPORT

https://accountants.intuit.com/support/en-us/help-article/import-export-data-files/importing-prior-y... This brings in the 1040 as a basis to start the return and to proforma to next year. It is not a full  return. This starts with a prior year pdf of the return, 

CONVERSION

https://accountants.intuit.com/support/en-us/help-article/convert-files/convert-tax-return-data-proc...

This get the whole return. You can amend, modify, massage, malign, marbleize, .... to you heart's context. This starts with a software file from some other software.   

I should also note: For Windows users: Adobe Reader 11.0 or higher is required for printing forms (this is a free download https://get.adobe.com/reader/).

For MAC Note: To preview and print forms, you also need the Firefox PDF Plugin.