Suggestions: File Layout Editor

I'd would like some suggestions on how to implement the actual bands, or
groupings, editor GUI for a file export system I am busy with. Currently, I
have a tree view on the left, explorer style, which lists as top level nodes
all the Sections in an export, e.g. Customers, Clients, Customer Invoices
etc. Then, under each section I have the data source queries for that
section, and all record defintions, i.e. column collections, for that
section. Now in the XML definition file, under the record definitions, I
have groupings to one level, where each grouping may be on Invoice Number.
Each grouping can have a header, emitted once before each group, body
emitted for each item in the group, and a footer, emitted once after each
group. Header, body, and footer can contain one or more lines that
correspond to record definitions. I'm now looking for ideas on how to
present the layout of these groupings to users for editing.


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