you can put several different kind of events in a channel, but each type of event can trigger only once per scriptfile. So you'll need to either put these into different scriptfiles, or merge everything into 1 event. You can do like below. What's not clear is whether you are wanting to send a message multiple times if it contains 2 or more of these labels. Also not clear is whether you want to have the msg sent to the destination channel on the same network where the message originates, or whether you want it to have messages from several networks going to 1 channel at 1 network. You'd need to either use /scon or /scid to send the messages to the other network/#channel or send the messages to a @Queue window from where a different timer script checks that window to display them in the destination.

https://en.wikichip.org/wiki/mirc/commands

If you use /scon or /scid, you'd need to take steps to avoid having your message risk being evaluated which could either mess up the display, or when people see that your messages are being evaluated, they could take steps to create a script which could evaluate something dangerous for you. Parking messages in the @queue window would avoid the evaluation problem, and also allows you to have the relayed messages be spaced far enough apart to avoid flooding - though you can also defend against this by enabling flood protection options/irc/flood

Code
on *:TEXT:*:#:{

var %strip $strip($1-)

if (($network == network1) && ($chan == #channelA)) {
    if ([NUKE] isin %strip) { scon 2 msg #[PREADD] $v2 }
elseif ([UNNUKE] isin %strip) { scon 2 msg #[PREADD] $v2 } }
elseif ([PRE] isin %strip) { scon 2 msg #[PREADD] $v2 }
}

if (($network == network1) && ($chan == #channelB)) {
    if ([NUKE] isin %strip) { scon 2 msg #[PREADD] $v2 }
elseif ([UNNUKE] isin %strip) { scon 2 msg #[PREADD] $v2 } }
elseif ([PRE] isin %strip) { scon 2 msg #[PREADD] $v2 }
}

if (($network == network2) && ($chan == #channelA)) {
    if ([NUKE] isin %strip) { scon 2 msg #[PREADD] $v2 }
elseif ([UNNUKE] isin %strip) { scon 2 msg #[PREADD] $v2 } }
elseif ([PRE] isin %strip) { scon 2 msg #[PREADD] $v2 }
}





 }