I want to input data into a field in layout A, and it appear in layout B. Each entry from A should then

make a list in B. I don't know how to dynamically create repeating fields. I have one table only. What is the basic concept?

There's not a lot of detail here. What are you capturing in these fields? Why are you storing multiple somethings in field A when related to field B? I might imagine valid reasons for needing this, but I don't know what they actually are. The only way I can imagine this, I always see a new table to capture the multiple things--like, say, line items on an invoice, where you have an arbitrary number of lines on an invoice. In that situation, you'd have a portal on layout B that shows related records from table A.

If you stay with the single table, you might be able to build some self-join relationship to show what you want.

David