How to expansion storage by item?

[Amellia sizilia sembiring]

hi, i want to implement expansion restriction. ex. at start the account have 10 slots storage inventory can be use.

 

they can make larger the storage by using item up to 200 and the unvaiable slot have picture like X.
 

[Haziel]

With in-built tools, it's quite hardto do this, specifically the graphic part, which is client-side, and, if you don't know yet (consedering your other posts) is something really hard to modify freely.
It's a source modification, far more complex than just a Script.

You will need to look at the recent implemented Official VIP system and see how it expand the slots, then, store the actual unlocked slots in some kind of variable or SQL table.
It's a long way to go and would require some time to be done.