While creating records from the lookup field (Appointment), A modal dialog pops up (which is an OOB feature that can be achieved by clicking the lookup field on the form and then ticking the checkbox to open and edit the main form in the dialog).
This main form works similarly to the Quick Create form.
Now, I want to prepopulate some data on this PopUp Appointment form when clicking the New Appointment button. Can you help me with this?