Spoiler
(else_try),
(lt,":item","itm_arty_horse_howitzer_french"), #Artillery Horse for Cannon
(item_set_slot,":item",slot_item_multiplayer_item_class, multi_item_class_type_horse_cannon),
(else_try),
(lt,":item","itm_gun1"),
(item_set_slot,":item",slot_item_multiplayer_item_class, multi_item_class_type_horse_howitzer),
(else_try),
(lt,":item","itm_pistol1"),
(item_set_slot,":item",slot_item_multiplayer_item_class2, multi_item_class_type_gun),
(item_set_slot,":item",slot_item_multiplayer_item_class, multi_item_class_type_gun),
(else_try),
(lt,":item","itm_hat1"),
(item_set_slot,":item",slot_item_multiplayer_item_class2, multi_item_class_type_pistol),
(else_try),
(lt,":item","itm_uniform1"),
(item_set_slot,":item",slot_item_multiplayer_item_class, multi_item_class_type_hat),
(else_try),
(lt,":item","itm_boot1"),
(item_set_slot,":item",slot_item_multiplayer_item_class, multi_item_class_type_uniform),
(else_try),
(lt,":item","itm_glove1"),
(item_set_slot,":item",slot_item_multiplayer_item_class, multi_item_class_type_boot),
(else_try),
(lt,":item","itm_shotgunbullet"),
(item_set_slot,":item",slot_item_multiplayer_item_class, multi_item_class_type_glove),
(else_try),
(lt,":item","itm_items_end"),
(item_set_slot,":item",slot_item_multiplayer_item_class, multi_item_class_type_bullet),
(item_set_slot,":item",slot_item_multiplayer_item_class2, multi_item_class_type_gun),
(try_end),
that you add. And to
them. You can add billions (not really) of items in between those new ones that will not mess-up your current build of items assigned.
Also watch out that you don't copy paste this 1:1 but insert it correctly.
Because the NW Module system adds items and assigns them to these classes to make sure you exactly get what the script thinks the troop is supposed to have.