# CDT Configuration ### Data Types are one of the cornerstones for customization in Welkin. This document will cover: * What are Custom Data Types and Configuration * How to use CDT's and What to Consider * Formulas **What are Custom Data Types and Configuration** Custom Data Types, or CDTs, allow for the entry of data points that may be used throughout Welkin. When creating a new CDT – it is best to think of the CDT name as the folder name, and the data fields created within the CDT (CDTFs) as sub-categories of that folder. CDT's are created in Designer. In the left hand vertical menu, select Custom Data > Data types. Click on +New in the Data Types screen After selecting +New, the New Data Type screen will appear. From here, enter the name (which can be considered the --- # 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.welkinhealth.com/designer/custom-data-types/cdt-configuration.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.