the answer items need to be exactly the same in the multiple choice and the array question.
Then in the array question under "logic" -> "array filter" you need to put the question id of the multiple choice question you want to filter upon. You find this question id in the interface "Question (ID:468)" in the header of the respective question.
docs.limesurvey.org/Question+type+-+Array#Array_filter
Then in the array question under "logic" -> "array filter" you need to put the question id of the multiple choice question you want to filter upon. You find this question id in the interface "Question (ID:468)" in the header of the respective question.
docs.limesurvey.org/Question+type+-+Array#Array_filter