Wage income abbreviations are for taxable income not listed on a W-2. Two examples of these abbreviations are "HSH" and "SCH". Those two abbreviations are mentioned on pages 26 & 27 of the 2018 Instructions for Form 1040. If applicable, these abbreviations are to be listed in the space to the left of line 1 on Form 1040 (2018).
Two wage income abbreviations apply to my income situation. However, Form 1040 (2018) in the Free File Fillable Forms software seems to support selecting only one such abbreviation from a drop-down list.
Is there a way to include more than one wage income abbreviation on Form 1040 (2018) in the Free File Fillable Forms software?