Replace a texture lump with Hires texture

Hi,

I'm trying to replace a wall texture, Slade detect it as a simple image, but XWE read this image as a lump.

Putting the HD texture with the same name into Hires folder of a pk3 is not working for me. I think there is a different way to do this with a texture lump, but i can't find it in the Zdoom wiki.

Some ideas?

Thaaaanks!!

okey! the texture lump works as a part of another original texture (and this is what i need to change)