On the 3100B appliances and until Avalanche version 3.80, it's not possible to use 1 GbE and 10 GbE interfaces simultaneously.
If you reserve one of the 10 GbE port groups, you cannot reserve any of the 1 GbE port groups at the same time (that is, they are disabled). Likewise, if you reserve any 1 GbE port group, then the 10 GbE port groups will be disabled.
Nevertheless, starting from version 3.90, users will be able to reserve various combinations of 10 GbE and 1 GbE port groups simultaneously.
Note: 3100B last supported version is 4.56