just for fun, try adding [CAN_STONE] to the crossbow bolts entry. At very least, it'll let you make them out of obsidian.(horrible waste of obsidian, though. Probably wood, too.)
I tried that once, it generated an error in errorlog.txt (I didn't actually test to see if it still made them in game).
This doesn't work, the option to make the bolts never appears for me.
Can't you just do this?
[REACTION:GLASS_BOLTS]
[NAME:make glass bolts]
[SMELTER]
[REAGENT:1:ROUGH:NO_SUBTYPE:GLASS_GREEN:NO_MATGLOSS]
[PRODUCT:100:25:AMMO:ITEM_AMMO_BOLTS:GLASS_GREEN:NO_MATGLOSS]
[FUEL]
This functions perfectly.
I WANT BOLTS THAT FIRE SMALLER BOLTS AND EXPLODE ON IMPACT!!!! THEN I WANT SOME SORT OF SUPER ADDY DWARF THAT PWNS EVERYONE!!111oneoneone
Again, I encounter a troll. I'm sure, though, that I'll be the one everyone's mad at for pointing it out.
Out of curiosity, why do you want to make bolts out of glass? Stone is much more abundant, typically clogs the map (what with how fast miners get to legendary and all), and overall makes more sense then glass...which you might find some fey dwarf demanding. ...
This is an idea I thought up for my particular glass fortress challenge, where I have no stone (do not break ground). Besides, glass is used for sharp objects in real life, and you can use it in DF for trap weapons, so why not simple glass spikes to launch at the enemy?