# addSubgroup(_:) Adds a subgroup to another group. ``` func addSubgroup(_ group: ABGroup!) -> Bool ``` ## Parameters `group` The group to add as a subgroup. ## Return Value if successful; otherwise, . ## Discussion If the `group` argument is already part of the receiver, this method does nothing and returns . If adding the group would create a recursion, this method also does nothing and returns . (For example, if the group Animal Lovers is in Dog Lovers, and you add Dog Lovers to Animal Lovers, that would create a recursion, which this method won’t allow.) If the `group` argument is `nil`, this method raises an exception. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)