Adding a purchasing source to your vendor connections allows you to easily create Purchase Orders.
Add a New Source in the Vendors area
First go to the Vendors area and find the vendor you would like to set up a source for, then click 'Add Source'.
Search for the name of the source you'd like to add, and if that source hasn't yet been added, click "+New Purchasing Source".
Add all of the contact details for that source and select a default shipping address.
Click 'Save' and you're all set!
Add a New Source by Defining a Source in Purchasing
You can also add a new source by going to the Purchasing tab of a project, and clicking 'Define Source.'
A window will appear in which to type in a name, click '+ New Purchasing Source' and add the rest of your source's contact information.