Adding additional cameras to 8 channel NVR

I have the WIFI 8 channel Zmodo NVR with 4 outdoor and 4 indoor cameras. I have only added 4 indoor cameras initially. Later I will be installing the other 4 cameras outdoors. What is the proper procedure for adding the additional 4 outdoor cameras? Would I have to remove the first 4 cameras from my account and then do a reinstall with all 8 cameras. The NVR model is ZP-NL18 and looks like the image here zmodo_8ch_wifi