The SSTB determination is made at the entity level.  

Partnership Module

Lacerte currently provides a Specified Service Trade or Business (SSTB) checkbox within the 'Other Information' sections of Screen 22, Other Schedule K Items in the subsection 'Section 199A'. (This flows to the Schedule K-1's Supplemental Information page attached).

S-Corporate Module

Lacerte currently provides a Specified Service Trade or Business (SSTB) checkbox within the 'Other Information' sections of Screen 27, Other Schedule K Items in the subsection 'Section 199A'. (This flows to the Schedule K-1's Supplemental Information page attached).

Qualified Business Income 199A - Specified Service Trade or Business (SSTB)  https://accountants-community.intuit.com/articles/1788190&src=lsccom