Currently when manually mapping fields in an import there is the option to Match, Ignore and Clear All. It is often the case that it would be easier to set the import to Ignore All and then to match only specific fields on an exception basis. The current requirement of clicking each field in the import you wish to Ignore can be depending on the import file very laborious.
The content in this article has not been evaluated for all Anaplan implementations and may not be recommended for your specific situation.
Please consult your internal administrators prior to applying any of the ideas or steps in this article.