hi
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hi

Hi nossi,
If I were you I´d use the Zbrush SubTool Master plugin.
"SubTool Master allows you to mirror, duplicate, merge, export all your subtools at once, fill all your subtools with color and/or materials and many other things!"
If you don´t have it you can download it here:
http://www.zbrushcentral.com/zbc/showthread.php?t=057154
Maybe there are other possibilities… but I only know this one so far. 