How can I customize the import template for new products on Shopify?

Topic summary

Main issue: Customizing Shopify’s product import template (CSV) to include additional columns and a way to flag items as “related products” without creating a separate collection URL.

Clarifications: The import template refers to the CSV used to bulk add products. “Related products” denotes items surfaced as recommendations; the user seeks a grouping mechanism like a collection but without generating a unique URL.

Status: No solutions or workarounds were provided in the thread. No decisions or actions were recorded. The question remains open with key details unanswered (which extra columns are supported and how to designate related products via import).

Summarized with AI on December 30. AI used: gpt-5.

I would like to know how to customize the Shopify template for importing new products; what other columns can I add? Specifically, I would like to know if there is a way to mark products that should show up under related products (like a collection but not making a unique URL for them)