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You can set any address(even if a member who's not the owner of the Safe) as a member and grant it with customized roles.
1.Go to "MEMBERS", click on "ADD MEMBER", enter the Member Name(stored locally, can be modified), the address of the member, and the roles you want to grant to it.
2.Sign the transaction with the Safe owners.
Now the member is granted with the roles, so he/she can initiate and sign the pre-defined transactions.
3.You may edit/delete the members anytime you want (you'll need to sign a transaction with Safe owners when you do it).