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If you have a box 20 with code Z, you should have a Statement or STMT with Section 199A information. 

When you enter the code Z for box 20, hit Continue.  After answering a few questions about your qualified business income (QBI), you come across two screens to enter the amounts from you Statement or STMT.  You'll need to put the information from that Statement/STMT into the categories shown in the "We need some information about your 199A income or loss" and "Let's check for some uncommon adjustments" screens (see two screenshots later in this post). The amounts in the Statement for box 20 code Z should fit in one of the categories on those two screens.

Note that the codes changed between 2018 and 2019, so references to a 2018 K-1 may not be valid.

Here are the screens you are looking for to enter the box 20 code Z Statement/STMT amounts: