On the Purchasing page of your project, the items are listed with their user-defined Purchasing Sources. If you'd like to change the current Purchasing Source to a different one, click on the name of the Purchasing Source to bring up the "Edit Purchasing Source" window.
In this window, you'll have the option to choose between all available Purchasing Sources for the item.
Selecting a new Purchasing Source will update the cost for this item in your project.
NOTE: The Sell Price cannot be edited from the Purchasing page since it is likely you are in a contract with your client now and don't want to be changing the Sell Price during purchasing. However, if you need to change the Sell Price for an item, you can go to the Builder, click on the item, adjust the Sell Price, and click Save.
Once the new Purchasing Source is selected, purchase orders can be created as usual.
We hope this helps! Please reach out to us in Support Chat with any questions!