How do you combine texture lumps?

[Obsidian]

I'm currently compiling the third A.S.S wad and I've run into a bit of a problem: 3 of the speedmappers involved used new textures with different texture lumps, and I'm not sure how I'm going to combine them manually. Is there any easier way to combine them so there aren't any screwups?

(A.S.S stands for the Abyssal Speedmapping Sessions: look for the first two sessions on the archives)

[Memfis]

When I was making wad compilations for TNS, I always used exl's WADMerge, it's pretty good at this.

[GreyGhost]

You can copy/paste texture definitions from wad to wad in Slade 3, it'll automagically copy across any patches required and update the PNAMES lump.