Created a custom record, with intention it will be a child record for QUOTE Under Fields : created a field

QUOTE

and ticked RECORD IS PARENT. Also on the QUOTE field, under Sourcing and Filtering > Filter Using - I put Type equal to QUOTE Now I want to edit the custom QUOTE form I have, so there is a tab called CUSTOM RECORD (for example) - where I can click : Create New ... and add a new custom record. How to add this custom record as a sublist ? Is it possible at all ? The Quote record has