To make it short, even if the structure is not exactly what you need (one again, sorry if I misunderstood your case):
you have to create links between tables before being able to get data from another table, or being able to summarize values like sum, min/max or average
do not hesitate to browse the links above from the SeaTable help about links
Hope that helps,
Bests,
Benjamin
Do it like thousands of other people who have used SeaTable to develop powerful processes and get their ideas and tasks done more efficiently.