It will be generated from input in Sch C, E and F and the K-1 input. Use Ctrl + F to Search for 199 or Search for Qualified   The program is not totally functional yet, so just try to get one specific you are looking for and post a comment below. 

e.g. Schedule C - Toward the Bottom is Deduction for Qualified Business Income - You will manually need to compute and input 4 entries there to get the computation. Hopefully this will improve in the next release.

EDIT: By the time you see this my description is too old to be of great value. Go to https://proconnect.intuit.com/community/help-articles/help/lacerte-simplified-worksheet-section-199a... for what is HOPEFULLY the latest information.