As a user building variants in web experimentation,

I would like to be able to save and reuse variants across campaigns, pages and projects while deciding at the campaign/page level whether to allow the selected version to stand apart or be kept in sync (copy local versus linked). Localized from linked save could require a new name but retain the link to the original and allow for a button to copy the parent for resync/update needs.

So that I can more easily have a dev, qa, prod environment setup in web experimentation.

This would likely require that variants live outside of the campaign (like pages, events, etc.) and be linked into the campaign.