# Create Assignment Rule There are multiple ways to assign a value to a field in assignment rules. Some of the most common are to assign a fixed value (e.g., a text string, a field from an available data view, a date, or with additional mathematical functions). This document will show all of these common assignment methods. The API call remains the same for all methods, the differences are in what entity fields are used in the body of the API call. This call is a POST call with the header of . --- # 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.apica.io/platform-docs/test-data-orchestrator-tdo/user-documentation/api-guide/assignment-rule-apis/create-assignment-rule.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.