For every item in a repeat grid, allow a toggle (probably by the grid itself) that allows you to edit an item without editing all items- for example, if I wanted to change the color of just one item in a grid of groups, allow me to toggle off the fact that if I change one, it will change all the others. New items will default to what the original item was. If you turn it off for that element, it will default to the one you have selected.
For every item in a repeat grid, allow a toggle (probably by the grid itself) that allows you to edit an item without editing all items- for example, if I wanted to change the color of just one item in a grid of groups, allow me to toggle off the fact that if I change one, it will change all the others. New items will default to what the original item was. If you turn it off for that element, it will default to the one you have selected.