If you did not join or weld the different parts to your crown you should be able to select them in UVmapper by going to the edit menu and select by group. Then edit menu assign to material. I would recommend especially on complex models assigning materials in Poser using the grouping tool. This lets you see the sub object in 3d as opposed to a flattened out mesh in UVmapper. Then go into UVmapper and create your template.

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

Albert Einstein