View Help Center article on adding codebtors here!

If you have common codebtors in a case, you can Save as Common Co-Debtor to this case so the information can be populated within the next codebtor you add.
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After you have saved the common codebtor, it will be available from a dropdown next time you add a codebtor.

If you are working in a Community Property State you can Save as Common Co-Debtor when you are adding Spouses & Dependents