We recommend that you do not remove (or delete) variations from a running campaign because it affects the statistical integrity of your campaign results. A running campaign would have started collecting data for all variations and removing a variation may corrupt your campaign results and mislead your decision-making process.
You can, however, clone a variation and then remove the sections you don’t want from the cloned campaign. Click here to know how to clone a campaign.
You can also disable a variation if you no longer need it for the test. Click here to learn how to disable a variation.