Updated 12/03/14
To make a change to a product in multistore, that will affect only specific store/s...
1
Open the item you wish to modify in the item browser.
2
Make any changes you wish to make. e.g. sell chances, cost changes, promo changes.
3
Select specific store(s).
4
Select the store/s you wish to apply the changes to.
5
Click the Save & close button.
To send your changes to stores see Multistore Host.