Let me explain with one business use case:
Use case: We need to develop a custom “Submit Case Form” where we would like to ask the customer to enter Name, Email, Case Category (Feedback, Inquiry, Issue), Description and upload any attachment(s).
a. Email should be check in account object, if exist - Case record to be created under that Account. And attachments(s) to be created under that newly created case.
b. If Email address is not found, it should create a new account record, a new case record under the account record and attachment(s) under the case record.
For end user - the web form should look like as one form.
Question
How to bind multiple model (2 Salesforce custom objects) into one screen to collect data.

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