Hmmm I do not follow you completely.

This is the full script now (which works perfectly)

on $*:text:/\[(New|Old)\]/iS:#SOURCECHANNEL:{
var %text = $strip($1-)
scon 2 msg #ECHOHERE % $+ text
}

This script makes it look like my nickname just says it into #ECHOHERE. What I want is, that botservice says it.

I can make the bot say something with this command in #ECHOHERE:

/bs say #ECHOHERE hello my name is a bot

So how do I put this in my script?