Business Rules are rules of automation that could have an impact on the whole system behavior. Therefore, only users with administrative privileges are able to set up new ones.
There is an option to share (provide a grant access) a business rule with other users within the account who can modify; enable/disable or delete them. We recommend sharing the business rules with users who are Project Managers for the same board.
To share a rule -> go to the "Share with" field in the rule configuration panel -> type the name of the user you wish to share the policy with. Don't forget to confirm the actions by clicking on the green checkmark of the corresponding rule.