> For the complete documentation index, see [llms.txt](https://docs.apica.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apica.io/platform-docs/test-data-orchestrator-tdo/user-documentation/tdo-project-builder-user-guide/determining-attributes/page-1.md).

# Manual Attribute Creation

This process is used when the values needed for the determining attribute are not available in a source file or when the determining attribute is a range of values.