To import your projects and cost numbers from e-conomic, just make sure the following box is checked in the setup of Corpay One's integration to e-conomic:

After this, of course, you must click the Save button at the bottom of the page to save your selection.

You can access the integration setup by clicking Settings > Integrations in the side menu and then selecting e-conomic > Connect.

When you have imported projects and cost numbers from e-conomic, two drop-down menus will appear on your attachments - one for projects and one for cost numbers:

The drop-down menus work in the same way as the category and department drop-down menus, so just select the desired project and cost number for an attachment here.