How to efficiently upload non-Duplicate Product Content

[Chempel]

Hello Experts,

We work with Plentymarkets, but Shopify only pulls out the Title and Bullets points below the title.

We try to launch our new shop, which has a lot of products and try to avoid duplicate Content (hence: Product Stories/templates arent the easy solution here). What is the most efficient way to upload the non-duplicate content (in bulk), and assign them to accordeon menus for example (so we dont have to copy+paste content for hundreds of products)? Is this possible with a CSV file? Are there themes more suited for this? Are there other, better ways?

Best Regards
Chris