How to delete the assignments in the tablet of interviewers?

How to delete the assignments in the tablet of interviewers? When I distributed the assignments to interviewers,I set the number as"-1",so there are old version questionnaires in interviewers’ tablet.I want to delete these old version questionnaires.but I want to retain the interviews from old version questionnaires.so what should I do?I don’t want to create more interviewers account.

Dear Sir,

We have released a new version yesterday.

Here are the details of the release: http://support.mysurvey.solutions/customer/portal/articles/2942597

You have to read about assignments upgrade. As far as I understood - this new feature should help to resolve your issue.

Best regards,

Survey Solutions team support

Dear Edison,

you can adjust the quota for each assignment to 0 to prevent further data collection based on that assignment.

Any interviews already completed will be sent to the HQ and retained (see “this article”:http://support.mysurvey.solutions/customer/portal/articles/2918252), but no new interviews will be permitted and interviews started, but not completed will be discarded.

Sincerely, Sergiy Radyakin