Can you auto-populate a field in Survey123 from another field by only pulling certain characters?

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I have a field where the user inputs text Aa1Bb2Cc3

Am I able to auto populate another field by only populating the field with Bb or 3. 

Auto populate the field with characters [4:6] or just [9]

How would I do this?

Thank you.

IsmaelChivite

The function substr could be of help for this. For example:

substr(${questionABC}, 4, 6)

For more info on XLSForm functions refer to: Quick reference—Survey123 for ArcGIS | ArcGIS