Tile a section of texture on one polygon

[Oceans14]

I'm trying to apply one section of a texture multiple times to a single polygon in xsi. For example, pandemic textures usually have 4 different "quads", and I want to apply one of them (1/4 of the whole texture) a few times to a polygon. I can't seem to figure out how to do it though. I've got a subprojection going and I can scale the texture to just the target poly, but I'm stuck on the last little bit.