Change or add an inventory kit

Hello
I have an inventory item incorporated into several kits. When we purchased this item again, the cost was quite a bit less since we were able to buy in a larger quantity. I did not want the cost of this item to be average so I created a new inventory item. If I change my kits to the new inventory item, will Manage change all previous sales with that kit to the new inventory item? Will it only change the kits going forward from the date of the change? Should I just create new kits?
Thanks for any input.

Yes.

Yes.

This might not have had as big an impact as you think. If your quantity of the original inventory item was small, its contribution to average cost would be swamped by a large purchase. And if you were out of stock of the item, the average cost will depend only on the new purchase. You might want to calculate the actual effect in a small spreadsheet before going to the trouble of recreating all your inventory kits.

Thanks for your knowledge!