Regarding auto populate follow up or baseline

In general, if you want to use data from an Entity, you need to use a lookup expression: https://docs.getodk.org/form-datasets/#lookup-expressions

If you want to autopopulate a value that is hidden or read-only, you can use a calculate. To autopopulate a value that a user can change, use a dynamic default.

If this doesn't answer your question, please either show a sample form or tell us more about what you're trying to do. Feel free to write in the language that is most comfortable to you!

And when you have a moment, we'd love to learn more about you and what you do in the introduction thread!

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