To map a Crowd Group to a Nexus Role, open up the Roles panel by clicking on the Roles link under the Security section of the Nexus menu. Click on the Add… button and select External Role Mapping as shown in Figure 19.12, “Adding an External Role Mapping”.
Selecting External Role Mapping will show the Map External Role dialog shown in Figure 19.13, “Mapping an External Crowd Group to a Nexus Role”.
Once you have mapped a Crowd Group to a Nexus Role, these Roles will appear in the list of Nexus Roles with a mapping value of "Crowd" as shown in Figure 19.14, “Two Crowd Groups Mapped to Nexus Roles”.