I think I just know it in http://www.tersus.com/#Id=6423
First you shoud creat a structure contains repeat data in top display element (maybe top level I'm not sure). And use <Init> to initialize it first before other action or display elements run. Maybe some SQL query in it.
Then in your chooser you are able to use it by parent type.(Copy and paste it by "reuse" and right click it to change the type to Parent.)
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