Product Content: "Checkout" uses "content tabs" in the "Additional Descriptions" area to organize sections of product descriptions (descriptive content sections; tabbed sub-sections of product descriptive content).
"content tab" = "Additional Description"
In the Checkout c-panel, Checkout refers to these as "Additional Descriptions" (in the product content area of the Checkout c-panel). They say, "Using additional descriptions makes use of the content tabs feature on product pages." In the c-panel, there is a button to add "additional descriptions" and the admin or editor can add as many "additional descriptions" as they wish.
In the native Checkout plug-in, each "Additional Description" can be applied to just one product
(end of "background information" section)
PROJECT DESCRIPTION: We want to have the ability to assign the same "Additional Description" item to multiple products.
DOCUMENTATION: Deliverables include documentation of any changes to CSS, code changes, or theme customizations that you make