By Dansercoer - Sun Sep 07, 2014 4:26 pm
In V3, the way of doing this is to check the "Use Override" box in the Texture Editor > Projection Properties section. The idea is that a given texture is always using either its own set of projection values, or it is using the global Override values, which are shared between all textures in the material. There is no separate UI for the Override values, as there is in MXED; rather, when you check that box, you are now editing them, regardless which particular texture might be active.
That said, the previous method of holding down CTRL or CTRL+SHIFT modifier keys (as explained here) while changing a texture value still applies, as well. In this case, which has nothing specifically to do with the global Override values, the value set is physically copied into other textures (all those in the parent layer with CTRL, and all those in the material with CTRL+SHIFT).