To bulk update the prices for cost items in a catalogue, navigate to Catalogues > select relevant Catalogue > and use the tick-box to select the items within the catalogue you would like to edit the pricing. Finally, click Bulk Edit, as shown below:

Next, in the pop-up menu on the right, under Price Update, choose to Change price by % or Change price by $ as shown below. Once you have entered the percentage change or $ change, select Save. This will automatically apply the price change across all selected items.

Note: The catalogue must be in status "Active" before you can use or bulk edit the items. To make the catalogue active, open the catalogue and click on the catalogues setting button (cog button) in the top right > edit the status using the drop-down > save changes.

You can also use this function to bulk edit the Cost Type and Cost Category.