Is there any way we can create various roles within a group?

What you can do is make sub-groups, and assign each of the groups to a larger group. Say you run a store with Menswear, Ladies, Juniors, and Housewares. You can make a Menswear Associates, Menswear Managers, Menswear Supervisors, and similar for all the other departments and arrange the groups inside the groups.

If you were to have a military contractor, you could separate people by base, and then by individual roles within each base, and further separate them in parallel by rank, and add a separation between officers and enlisted driven by rank (since officer ranks and enlisted ranks are all different). And if it's a large enough contract, maybe you'll need to separate all personnel by Branch. You can make groups that store people who are in specific combinations of groups, like Officers who are at least this paygrade who have this role at this base are allowed to see the Action. It's all done by nesting groups.

What you can do is make sub-groups, and assign each of the groups to a larger group. Say you run a store with Menswear, Ladies, Juniors, and Housewares. You can make a Menswear Associates, Menswear Managers, Menswear Supervisors, and similar for all the other departments and arrange the groups inside the groups.

If you were to have a military contractor, you could separate people by base, and then by individual roles within each base, and further separate them in parallel by rank, and add a separation between officers and enlisted driven by rank (since officer ranks and enlisted ranks are all different). And if it's a large enough contract, maybe you'll need to separate all personnel by Branch. You can make groups that store people who are in specific combinations of groups, like Officers who are at least this paygrade who have this role at this base are allowed to see the Action. It's all done by nesting groups.