Hi there,
Thanks for your question.
choose a record from a Form table using a Select field
First of all, in your select box, use Default Form Options Binder.
then have other fields on the form automatically populate (readonly) from other fields in the same form table row
Add a AJAX Subform into your form, configure Parent Field to keep Subform ID to your select box ID,
Reload Sub Form when Parent Field value change? to Yes
Set store binder to Parent Form Binder.
When you click save, all the fields inside the ajax subform will be saved into the parent form (current form).
If you ajax subform has field called "name", "address". Then your parent form with these fields will be overwritten.
Hope this helps.
Hugo