Use the choices of a multiple selection variable to ask the following questions of a questionnaire modality by modality

Support
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1

I have an xlsform or I have a multiple choice question. I want that after having chosen several modalities, the series of questions takes place for each modality, one by one

2

You can use the selected() function as relevant filter for each group of modality questions. See https://getodk.github.io/xforms-spec/#fn:selected.