After the groups have been imported, you can go to Admin => Security => Groups to confirm that those ldap groups show up there. Since it is not Artifactory's internal groups, it will have "External" checked. As you can see in the screenshot below, it does not have any permission targets associated with it yet
Now, let's create Read permission to domain guests and Read, Annotate, Cache permissions to pd managers at Admin => Security => Permissions. After selecting repositories, go to Groups and assign permissions as you wanted.