I know it's possible using a custom record where 'Allow inline editing' is enabled, to create loads of instances of the custom record as a sublist to another record. For example, if I have a custom record with a transaction field marked 'Record is Parent' and the record is set to allow inline editing, in the creation or edit of the parent transaction I can use sublist APIs to add new instances of the custom record. My question is, can I add existing instances of the custom record to the transaction's sublist? I've tried setting the 'id' or 'internalid' field on the sublist to the internal id of a custom record instance, but it still just creates new records. Anyone have experience with this?

no sublist related options, your choices are editing each child record or attaching each child record

Thanks for the reply. Wish it weren't so! 🙂