What happens when copying permissions from one group to another?

When copying permissions from one group to another, all permissions from the source group are indeed overwritten in the target group, including item-level security settings. This means that the target group will adopt the exact same permissions as the source group, effectively replacing any existing permissions that were previously assigned to the target group.

This process ensures that the target group has the same level of access and restrictions as the source group. It is crucial to understand that when permissions are copied in this manner, any unique permissions that applied to items within the target group will also get replaced, thereby aligning completely with the source group's permissions. This allows for streamlined management of access rights, especially in environments where consistency across groups is necessary.

Additionally, since the permissions are explicitly copied rather than just referenced or altered, there is no risk of some permissions being retained while others are discarded, which would be the case if permissions were partially copied or only specific elements were updated. Hence, this method ensures a uniform approach to permission management.