As mentioned, if you want to bulk update item prices, such as increase all item prices by some percentage, you must run the Suggest Item Price on Wksh. batch job. You can find a link to the batch job on the Sales Price Worksheet page.
Do you mean when using sales prices? From the new sales price experience you have the option to copy lines/suggest lines from within a sales price list. Within this you can then apply an adjustment factor.
So if you are copy prices from another list then the adjustment factor will be applied to the new sales prices created.
If you mean the unit price on the item card, then I don't believe there is a way to increase this without exporting and re-importing.
Hope that helps,
Shauna
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