Line 22b of Form IT-203 is the line where you report other additions that are not specifically listed on Form IT-203. This amount must sum to the entries from Form IT-225, line 1.
The additions that could pertain to your return start on page 17 of Instructions for IT-225. The allocation of the amount on IT-225 should match the amount on Form IT-203, Line 22b.
Once you determine which addition pertains to your return, and need additional assistance, please comment back so we can assist you further.