Is it possible to add a sub-form for one-to-many relationship?
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Is this on the front end or backend? Anytime ive needed a 1 to many relation ive used a ComplexTableField - http://doc.silverstripe.com/doku.php?id=complextablefield or if you dont need to add options or delete (just select) you could use a CheckBoxSet field - http://doc.silverstripe.com/doku.php?id=checkboxsetfield which I think you can get working with a one to many as well as a many many