First add the npc here and call the function for the fourth shop or just simply call the function for fourth shop with this command 'callfunc "qshop", 4;' if your npc is in difference file.
// ADD YOUR NPC HERE
//============================================================
prontera,180,213,4 script Quest Worker 556,{ callfunc "qshop",1; }
prontera,184,209,4 script Event Ticket Shop 112,{ callfunc "qshop",2; }
new_1-1,155,111,5 script Costume Shop 555,{ callfunc "qshop",3; }
// add the npc for the fourth shop
prontera,182,211,4 script Fourth NPC 556,{ callfunc "qshop",4; }
Make sure you already add the duplicate NPC data for the fourth shop with the name qshop4:
- shop qshop4 -1,909:-1;
Then add the shop into the array
setarray .Shops$[1],
"Hat Maker", // Shop Named 1
"Weapons", // Shop Named 2
"Other"; // Shop Named 3
"Fourth Shop";
Last step, use the add function to add the items to the shop
// Fourth Shop
Add(4,501,1,0,0);
Make sure the first index on add function is the number referring to the shop number you want to use. For ex: Add(1,501,1,0,0); to open the first shop, Add(2,501,1,0,0); to open the second shop and so on...
Jesky's post in Making Quest shop number 4? was marked as the answer