Trying to iterate through subproject tasks

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Hi -

I've got a master project that has subprojects, which in turn have
subprojects. What I would like to do is to take one of the custom text
fields, and for each task in the master project and each subproject, display
the name of the parent project to that subproject in that field. I'm having
trouble doing this because I can only step through the master project
(ActiveProject) - I don't know how to iterate through the subprojects -- any
ideas?

Steph