I don't know if I am drawing a blank right now, but I can't seem to figure out how to make a saved search that only shows transactions created from memorized transactions. For example I would want to see these 3 invoices created from the Memorized Transaction Definition record.

In the criteria of the search you can select "Memorized" and set it to "Yes"

Unfortunately I think that only shows the memorized transaction itself and not the invoices created from it.