Bug 1627465 will add new functionality for host networking configuration, which should be documented.
I believe the following should be added to the docs as a warning: Given host1 has no network attachments (besides the management network which has to be attached otherwise there is no connection to the host), And host2 has one or more network attachments (in addition to the management network) When a 'copyhostnetworks' action is performed provided the source host is host1 and the destination host is host2 Then all network attachments (besides the management network) are removed. This stems from the feature's design which copies the source host's 'state', meaning if the source host has no attachments (other than management network) then all attachments of the destination host (other than management network) will be removed. furthermore, the term 'state' also covers bonds - meaning if the source host does not have any bonds and the destination host does have them, then performing a copy will remove the bonds from the destination host and vice versa.
This bz should track the UI changes in bz#1768937, which is set for 4.4.3. Updated the target release.