If I understand you correctly: Get your ten layers, click edit -> Copy visible, edit -> paste, and assign the floating pasted layer to a new layer by later -> new layer. I dunno if there's a more elegant way of doing it mind you, but that's what came to mind and seemed to work pretty easily when I just tried it on three layers and the combined image sat on top of the three other layers.
hehe, I wish GIMP could autosave...




Bad things about a free programm!
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