Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

An interface can be a member of only one port channel. If the interface is a member of a port channel, remove it from the first port channel and then add it to the second port channel.

1. Remove the interface from the first port channel. INTERFACE PORT-CHANNEL mode no channel-member interface
2. Change to the second port channel INTERFACE mode. INTERFACE PORT-CHANNEL mode interface port-channel id number
3. Add the interface to the second port channel. INTERFACE PORT-CHANNEL mode channel-member interface

Dell(conf-if-po-1)#show config
                                 !
                                 interface Port-channel 1
                                 no ip address
                                 channel-member TenGigabitEthernet 0/16
                                 shutdown
                                 Dell(conf-if-po-1)#no chann tengig 1/8
                                 Dell(conf-if-po-1)#int port 5
                                 Dell(conf-if-po-5)#channel tengig 1/8
                                 Dell(conf-if-po-5)#show conf
                                 !
                                 interface Port-channel 5
                                 no ip address
                                 channel-member TenGigabitEthernet 1/8
                                 shutdown
                                 Dell(conf-if-po-5)#