On page X we don't need to setup the Initial Order field, so, leave it empty.
We need to setup the logic of saving the new order in DataBase.
In our demo, we've used a separate DataBase where the new order is saved.
Basically it is 1 field only and 1 thing in DB, no need to save it in every thing from your database that you are use for repeating group. See the screenshot below, we use the DB Analytics for that, and observe that there's only 1 thing that we are using to save it.