Hi,
Two ways,
1. See this blog:
http://www.bizsupportonline.net/infopath2007/programmatically-move-items-between-two-lists-infopath.htm
2. Create two multiselect boxes, then on the second one make that datasource be connected to the first.
Hope it could help
Hemendra: "Yesterday is just a memory,Tomorrow we may never see"
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