You can put an order on-hold to sort out price differences, check delivery-date with your supplier or any other thing that takes some time.
Result
Order status shows
= Line is on-hold
After putting the order on-hold, you have to release the order to perform the required changes or confirmation.
Result
Order status shows = Line confirmed without changes
Or
Order status shows = Line is confirmed with changes
Instead of putting the whole order on-hold, you can also put one order line on-hold and confirm the other order lines.
Result
Order status shows
= Order line is on-hold