making mercs recruit in different regions

EDIT: I think I sussed this - you just copy & paste the relevant lines below the relevant regions in the merenaries.txt file. But I think changes only show up if you start a new campaign. Any extra comment son this topic still welcome.

Hi There,

Is it possible to add mercenaries to new regions? For example, Free Company Longbowmen in England or Galloglaich in France? If it's possible, what's the best method of implementing this? Many thanks in advance for replies.