If you amended your federal return to add a Form 1099-B and Form 1099-DIV, you don't need to make any separate entries in the amendment process for MA. You just need to complete the amendment interview and reviews/checks.
State returns (including amended ones) are prepared using inputs to the federal return; the state interview will address any necessary adjustments or changes from what was entered for the federal return but rarely, if ever, require any new entries.
Depending on the amounts involved (1099-DIV and 1099-B), it is entirely possible that the changes had no effect on your MA tax liability.
