If you have many similar products at the same price, you don't have to change the price of each one separately. You can assign products to a price group and manage their prices in one place. You can define your own price templates covering: product price, wholesale prices, currencies, VAT and old price (crossed out). Additionally, there is an option to import and export assigning products to a price group.
In the admin panel, go to Applications → Price Groups
Or
You can also use the Import / Export function to mass assign products to a given price group.
Return to Applications → Price groups
Enter a value e.g.:
10.00
→ will set a new price of 10.00,+10.00
→ will add to the current price 10.00,-10.00
→ will subtract from the current price 10.00,+10%
→ will add to the current price 10%,-10%
→ will subtract from the current price 10%,Changes for currencies are made analogously to changes for the main currency. See above.
See the Prices in currencies documentation.