Re: How to populate items from a tracker
This is a complete off-hand response and I've spent absolutely zero brain power thinking about this but have you looked at the Item Link and Items List tracker fields. They allow you to link a field from one tracker to another such that you can view a list of entries from one tracker via the other.
They take some getting your head round if you're not used to databases but they are very powerful when used well. The Linking Trackers page on ))DocTiki(( should help get you started, or even at least give you an idea if this will fulfil your needs.
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