That feature is not available in Webinoly and to be honest I never liked the idea. We are focused on performance and having installed more than one PHP is resource consuming.
You don't need multiple servers, you can use only one PHP version at a time, but can change it every time you want, so you can test your old site, fix it and change the PHP version for the final site version.
Also, Webinoly will completely remove support for PHP 5.6 and 7.0 at the end of April 2019, so this won't be an issue anymore.
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