You can flag items within the catalog as Pickup (physical) items, Gift Certificates, or both. Items can be flagged individually or via bulk edits and any flags set will display on the Will Call Report.
To Flag Individual Items for Will Call:
Go to Catalog > Add or Edit and Item
Will Call data displays in the default view of the Catalog Gridview and Will Call Report. In addition, will call flags display as icons on all check-out screens and receipts: