Just put that:
SomeAlias {
echo -set This Is Some Alias
}
Alias OtherAlias {
echo -set If You execute SomeAlias also you will see that..
echo -set Also all parameters $1- from previus alias will be here..
}
In Aliases section in mIRC Script Editor.. And call /SomeAlias..
I think normaly all commands after the last } from the SomeAlias must be ignored..