aja, you need to share some fields of a repeater already created into some new field group? that´s it?
You have a “clone” field, don´t know if it´s only available on ACFPro i only use that version, but with that “clone” field you can just do that, clone some fields into some new group.
So, you don´t need to create a new repeater on the new field group, just create a clone one and choose the old repeater to clone. From front-end side will be almost the same thing you already have. See documentation better to understand how it works, not hard at all.
Good luck!
