# Incremental import Importing data via provided import files is incremental. Only present-in-the-file data is changed and the rest is not modified. Consider following: * translation data is changed only in languages provided in the file (column `_language`) * if a column is not present corresponding resource property is left unmodified * if a `Product` attribute column is not present values for this attribute are not changed * if a translation column is present and has an empty value the translation value shall be deleted {% hint style="info" %} templates\_elements.csv, section\_templates\_elements.csv, category\_trees\_elements.csv are exceptions from the above rules. Since those files represent one resource they are attached to the entire resource(template, section, category tree) is imported at once which means if an element is missing in the file the element will be deleted from the resource if was there prior to import. {% endhint %} --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.ergonode.com/ergonode-transfer/overview/incremental-import.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.