View filters may be applied retroactively to any data that has been processed.

Use filters to limit or modify the data in a view. For example, you can use filters to exclude traffic from particular IP addresses, include only data from specific subdomains or directories, or convert dynamic page URLs to readable text strings.Filters are applied after your data has been processed. Creating a filter to change the scope of dimensions is not possible. Also, filters are destructive. You can’t apply filters to data that has been processed. Tip: Use filter verification to make sure your filters are performing as expected before applying them to your incoming data.