There is no difference between new and updated issues in the handling of the text. You need to use quotes if the CSV format requires you to,
Update:
Regarding updating issues: In that case the CSV-file must contain the JIRA-Issue-Id column; keeping an empty string in Summary as "" cause the importer to wipe the existing text in the corresponding JIRA issue.
You only need to wrap in "" if the content could contain a comma.
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If you are using the CSV import file to create new issues then you need to put the correct text in the column for Summary. If however, you are using the CSV import file to update fields other than the summary then you should leave the summary empty.
Quote from Atlassian documentation on updating.
Importing a CSV to update existing issues will reset columns to their default values if they are not specified in the CSV.
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how do i have to name the Parent ID in my header row ? I wonder since this is not the field name for "Mother Issues" in Jira. There this field is just named Key. So do i have to name it key in the header row ?
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You only need to include Parent ID if you are creating subtasks and this is where you would put the key of the issue which this is to be a subtask of.
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