My Search-Fu is weak!
I know that if i change from Arms to Mysticism I will lose all my crafting skill:
Switching Crafting Schools
At the moment you don't lose any Blueprints you may have learned, but your skill is lost if you switch. So if you switch from Arms to Mysticism crafting, your skill level will be 1 and your crafting skill should reset to Competent (max skill level 100)
But what I dont know is what happens if i swap from Arms - Fighting Styles to Arms - Ordinance.
With the recent respecs my character concept has changed quite radically and I use guns instead of fists now, so was planning on swapping for both RP reasons and for the costume unlocks, Not sure a Gi will be as useful to me as some power armour these days. (note I dont actually know what the costume unlocks are).
Comments
Still, simple answer.
Your arms: fighting styles do NOT require arms:fighting styles skill points to craft, they just require arms skill points to craft.
Your arms: Ordnance do NOT require arms: Ordnance skill points to craft, they just require arms skill points to craft.
So, if you have 300 arms and you are specced in fighting styles, and you switch to ordnance, you go down to 1 arms, but as soon as you have enough points to use one of the patterns you already had, you can use it again.
There is not much point in this, however, as right now all of the crafting specializations are identical within each school.