It is possible to update sales prices on specific products or all products using the sales price management (SPM) application. More information can be found here:

SPM - sales price management

A file can be created to upload products to a specific 'product group' using the input job:

To be able to use this input job, the user must have access to the permission: PRM/CreateProductGroup 

When a product group is created, it will be possible to use the 'Bulk Price Update' in the sales price management (SPM) application for updating prices on the specific product group.