How To Bulk Fixing Variants Prices In One Product
At your store home page on https://seller.merchize.com/, go to Products.
In the Products section, click the name of the product you want to edit the price.
Scroll down to the Variants section, you can tick the variants that need to be fixed or tick the top box to select all variants, select Actions -> Edit price.
In the Top up form, enter the new price and select Save.