You can place an interface in a new IPMP group when the interface belongs to an existing IPMP group. You do not need to remove the interface from the current IPMP group. When you place the interface in a new group, the interface is automatically removed from any existing IPMP group.
# ipadm add-ipmp -i under-interface ipmp-interface
under-interface refers to the underlying interface that you want to move and ipmp-interface refers to the IPMP interface to which you want to move the underlying interface.
In the following example, the underlying interfaces of the IPMP group are net0, net1, and net2. The example shows how to remove the net0 interface from IPMP group ipmp0 and then places net0 in the IPMP group cs-link1.
# ipadm add-ipmp -i net0 ca-link1