Custom Magic Items for HLO?

[wrs92103]

I have a character which is getting into crafting magic items, and I'm wondering if there is a way to add custom items, like a belt of physical perfection which gives a +2 to some stats and a +4 to others. Basically what you have when you start with a belt +2 and can upgrade one attribute and not the others.

We have HL Classic, so if there's a way to make it there and export it, that's fine too.