[HELP]Adding Skill to Item

Hello Everyone,
I want to add some skills to Items.
I tried to add but failed :/

I tried to do as follows;
_RefAbilityItemOptLevel
1 91 2164 0

RefSkillByItemOptLevel
91 45000

same as media.pk2

but doesn't work.

help me please.
Thanks

what you mean?

i want to add some skills to a specific item.

This should help you out
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SnowStorm answered you.
good luck