C: 
1.    : trade = misc\trade_???.ltx
2.      config/misc   :

[trader]
buy_condition = trader_generic_buy
sell_condition = {+esc_kill_bandits_quest_done} trader_after_fabric_sell, trader_start_sell
buy_supplies = {+esc_kill_bandits_quest_done} supplies_after_fabric, supplies_start
#include "shop_???\???_buy.ltx"
#include "shop_???\???_supl.ltx"
#include "shop_???\???_trade.ltx"

3.  "shop_???"       ()  ,  .