What's the best way to submit a new trial?

A trial has a number of different components, so the question is what is the best way to fill all of them without getting confused.
My approach is to start with the simple and/or more generic ones first and do the GM tree event and the actual trial as the last items. I start with notifier, location and tree species - a lot of them are already there anyway. Then I check whether the trait/phenotype exists and if not add the gene/transgenic insert and the trait. All of those can be done without any cross-references to the (new) GM event and trial. Then I include first the GM tree(s) with the appropriate references, and then the trial with the all its references.