My understanding is that this import from pdf is only to populate the prior year amounts for the summary that will print the next year. It ONLY imports the 1040 and none of the other pages of the return. It is NOT intended to do all the input of the return, e.g. so you can prepare the amended return.

If you have the files from another software, you can convert. That will get everything (probably) and you now have usable file data to amend or do anything else you might want to do with the prior year, including state returns.

P.S. Use of abbreviations can be confusing, so please don't use they. I initially thought you were have problems with a Part Year (PY) return.