Yes. Just edit these. They also have the guide, just read them and you'll be able to follow it.
// -----------------------------------------------------------
// Basic shop settings.
// -----------------------------------------------------------
set .Announce,1; // Announce quest completion? (1: yes / 0: no)
set .ShowSlot,1; // Show item slots? (2: all equipment / 1: if slots > 0 / 0: never)
set .ShowID,0; // Show item IDs? (1: yes / 0: no)
set .ShowZeny,0; // Show Zeny cost, if any? (1: yes / 0: no)
set .MaxStack,100; // Max number of quest items purchased at one time.
// -----------------------------------------------------------
// Points variable -- optional quest requirement.
// setarray .Points$[0],"<variable name>","<display name>";
// -----------------------------------------------------------
setarray .Points$[0],"#CASHPOINTS","Cash Points";
// -----------------------------------------------------------
// Shop IDs -- to add shops, copy dummy data at bottom of file.
// setarray .Shops$[1],"<Shop 1>","<Shop 2>"{,...};
// -----------------------------------------------------------
setarray .Shops$[1],"Headgears","Weapons","Other";
// -----------------------------------------------------------
// Quest items -- do NOT use a reward item more than once!
// Add(<shop ID>,<reward ID>,<reward amount>,
// <Zeny cost>,<point cost>,
// <required item ID>,<required item amount>{,...});
// -----------------------------------------------------------
Add(1,5022,1,0,0,7086,1,969,10,999,40,1003,50,984,2);
Add(1,5032,1,0,0,1059,250,2221,1,2227,1,7063,600);
Add(1,5027,1,0,0,2252,1,1036,400,7001,50,4052,1);
Add(1,5045,1,0,0,2252,1,1054,450,943,1200);
Add(2,1224,1,0,0,7297,30,969,10,999,50,714,10);
Add(2,1225,1,0,0,7292,30,969,10,999,50,714,10);
Add(3,531,1,3,0,512,1,713,1);
Add(3,532,1,3,0,513,1,713,1);
Add(3,533,1,3,0,514,1,713,1);
Add(3,534,1,3,0,515,1,713,1);
// -----------------------------------------------------------