Ok, but we have two LLC-Partnership returns that both wish to elect Sub-S for tax year 2021 so why does Lacerte not make 2553 available in the Partnership module? Do you recommend just attaching it as a PDF??
Since you are timely filing for a 2021 S election, it gets mailed to the Service. Get the form from irs.gov, or a forms service if you use one, and fill it out.