Custom Items are used primarily for finance purposes and do not trigger orders to a specific provider.
Read more about Order Items vs Custom Items here.
To add a Custom Item directly to a campaign, outside of the vendor marketing quote process:
Within the campaign, go to Orders > Approve Orders
Click Add Custom Item in the Tools module
Start typing the name of your custom item
If the custom item already exists withing your agency settings, it will appear in the drop down list for you to select
If the custom item doesn't already exist, simply enter the name of the item together with the price
Click Create Campaign Item
The item will now appear on the Approved Orders tab and be available for invoicing to your vendor.

