Once you've used and finished with a SharePoint survey, you can delete all the responses, but keep the questions for reuse.
Delete all or some survey data
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Navigate to the Microsoft 365 or SharePoint site you want to delete the survey data from.
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In the address line, put sitemanager.aspx after /_layouts/ after the company or site name, and then press Enter.
Some locations in SharePoint don't always have /_layouts/ in the web address. If the line doesn't have /_layouts/ in the address, replace everything after the company or site name with /_layouts/sitemanager.aspx.
For example, if your site is the Contoso Mining site, your address line would look like this: http://contoso.com/sites/Contosomining/_layouts/sitemanager.aspx. SharePoint may automatically put a number that coincides with your version between /_layouts/ and sitemanager.aspx, you can ignore this.
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In Site Manager or Site Content and Structure, click the name of your survey in the Quick Launch bar on the left.
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Click the select all icon at the top of the selection column.
If you want to delete some of the answers, just click the boxes you want to remove.
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Click Actions, and then click Delete.
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Click OK.
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To return to your site, click Site Settings in the breadcrumbs, and then click Home or the page you want to go to in the Quick Launch bar.