Well hopefully the obj is not one solid mesh with no sub objects. If it is your pretty much in a bind. If they made it really user friendly the leaves will be one sub object and the tree another. If this is the case, in UVmapper go to the edit menu >select >by group. If there are multiple groups you are in luck. Once you arrange the template like you want it save the model and template. If you don't save the model your template want work. I'd also sugest assigning each sub object to a material group. Even if you use the same texture map you can adjust the high light color and trans pareniecs seperatly in poser. Of course you can assign material groups in Poser with the grouping tool. I do this a lot because its easier to comprhend what your looking at in 3d. Hope this helps.

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"The true sign of intelligence is not knowledge but imagination".

Albert Einstein