callshop NPC that only displays specific items on my inventory

[norightinfo]

Hi does anyone has an npc script that will only display specific items from my inventory?

Is there a way for a "callshop" function to display a specific items on my inventory whenever I sell my items?
I came across this topic but can't seems to figure out how. 
Here is a sample screenshot provided by the OP in the link:


So basically in his inventory he has 3 items as listed <Red Potion>, <Orange Potion> and <Yellow Potion>, however he wanted for the NPC to only display the <Orange Potion> and <Yellow Potion> in the window list.

[mR L]

https://github.com/rathena/rathena/blob/master/db/pre-re/item_db_usable.yml

 

  - Id: 501
    AegisName: Red_Potion
    Name: Red Potion
    Type: Healing
    Buy: 50
    Weight: 70
    Trade:
      NoSell: true
    Script: |
      itemheal rand(45,65),0;