The transfer table is a temporary dumping ground where data can be fooled with to either move from A to B or manipulate it betwen those points.
If you run the Import wizard (Get External Data) in Access and pull the information out of your spreadsheet, tell the Wizard to import to a new table; this works around the necessity of presetting your table with title fields and so on.
Once it has been imported (or you can also do this with a simple linked table - but be warned that a link table between Access and Excel will not have an autonumber field if you need one) you can do the following:
Query the information to sort or arrange to taste (the query can append to or update an existing destination table(s) in your D-base)
Run calculations on your data prior to targeting your output to destination table(s)
etc,.
You can set up an SQL query that will create a temporary transfer table, sort the information you are pulling out of Excel according to your needs and place the outputs in the destination of your choice. Since this table will either be created and then deleted on the fly when the query is called, or permanently set up but with no held information if it will be used regularly, it takes up next to no space in the D-base so you don't suffer bloat or a performance hit.
As you may have guessed, I like transfer tables. They are a perfect temporary processing area where you may choose to do some tricks or simply move information from one point to another without manipulating it mid-way.
Finally, regarding your text-file spec problem: I haven't the faintest clue. Without knowing any relevant details of the text-file output or its intended/actual/historical use, I can't even begin to guess. Is it comma or tab delimited (or even delimited at all), is it ordered or arranged information or memo notes, it is...
Get the picture ?
Sorry I can't wave a wand for you, but I'm flying blind here. I think you need to either offer more detail or show the relevant D-base/files to someone first hand.
Good luck in reaching a solution.
Regards