How to Attach an Item to a File or Model
In the Explorer dialog File tab, right-click on the file or model to which you want to attach the item and select Attach Item.
(Optional) In the Attach Item tool settings window, select the item type from the Item Type drop-down list.
(Optional) In the Attach Item tool settings window, change the values of the properties.
In the Attach Item tool settings window, click Attach.