Uhh, this belongs in creation and customization. And all you need to do is put a copy of civ4techinfos in customassets and change the tech costs of a certain era to -1.
You mean a certain tech , but in this case it's different. -1 for the cost needs to disabling the item for nearly everything, but not for techs, there you have to set bDisable for the desired techs to 1.
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