If you have Discounts for multiple bookings enable, you will now be able to set different prices for multiple bookings made at once. (Note: Depending on you Price By setting, your Bulk Pricing option will be under either Staff, Resources, or Services.) To enable go to Cog/Setting icon > Setting > Pricing and enable Offer discounts for multiple bookings under the Discounts field.
From the Dashboard, click Configure.
Mouse-over the Actions icon for the desired Resource and click Edit.
Navigate to the Pricing section and click Edit Bulk Pricing to change pricing based on amount of Bookings made at once.
Click Save/Update to save the changes.