Price list confirmation in Retail

Dear experts,

I have two questions regarding possibilties of managing prices for a product centrally and from a store.

1) First of all I need to know if stores can accept/deny/modify prices they receive from a headquarter? If yes, can it be done automatically and manually?

For example: a store receives a price list through the distribution schedule function in the retail module.

2) Is there a way to block price changes centrally, so that stores cannot make any changes?

Not sure if a costing version can do the job.

Best regards

Bart