If you do want to make glass bolts via smelter reactions I think it would go something like this.
[REAGENT:BAR:NO_SUBTYPE:GLASS:GLASS_{type}]
what the reaction for botls, er not sure on that one
Glass doesn't have subtypes like metal does; each kind of glass is its own type. Bolts would be AMMO:ITEM_AMMO_BOLTS:[material type]:[material subtype]
I don't think you can order the game to spit out bars of glass, as there's no way of obtaining them in-game (I can't test anything at the moment because the computer's running like chilled molasses and even surfing the net is occasionally excruciating). If you really must have glass bolts, you might have to mod in glass metal* (give it the [DEEP] tag unless you want to be able to buy it and items made from it) and mod a reaction to turn rough green glass into either a bar of 'glass' or a stack of 'glass' bolts.
The metal route would require the following mods:
Add to matgloss_metal.txt:
[MATGLOSS_METAL:GLASS]
[NAME:glass][ADJ:glass][COLOR:2:2:0]
[VALUE:1]
[SPEC_HEAT:385]
[MELTING_POINT:11952]
[BOILING_POINT:14611]
[AMMO]
[DAMAGE_PERC:50]
[SOLID_DENSITY:8930]
[DEEP]
Values adapted from copper, so they're not really true to life. The damage value is unecessary because the default is 50, but it's easier to modify if I leave it in. Since it's a metal and you have to order metalwork by material, you won't get any other glass goods unless you make the order directly.
Add
one of the following to reaction_standard.txt
[REACTION:GLASS_BOLTS]
[NAME:make glass bars]
[SMELTER]
[REAGENT:1:ROUGH:NO_SUBTYPE:GLASS_GREEN:NO_SUBTYPE]
[PRODUCT:100:1:BAR:NO_SUBTYPE:METAL:GLASS]
[FUEL]
[REACTION:GLASS_BOLTS]
[NAME:make glass bolts]
[SMELTER]
[REAGENT:1:ROUGH:NO_SUBTYPE:GLASS_GREEN:NO_SUBTYPE]
[PRODUCT:100:1:AMMO:ITEM_AMMO_BOLTS:METAL:GLASS]
[FUEL]
The last
should give you a stack of however many bolts you'd usually get out of a bar of metal. (I'm pretty sure the material-to-bolt ratio is hardcoded.)
Glass and wood are currently hardcoded in their use, so while making a new kind of wood or bone and slapping the 'glass' label on it would produce bolts, it would also produce glass beds or crossbows.