Temporary class skills? Adding a class skill for one PC only



for a specific character the GM has ruled he has diplomacy as class skill.
I'd like to put this into PCGen without changing all characters.

So is there a way to add a skill to the list of class skills temporarily?
I am able to homebrew a temporary +3 condition but that does not make it a class skill.

Any idea how and where to add a class skill to one PCs list?

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