Assign copy to several different product pages

[emily333]

Hello. We have several products. I need to create a description for each of the following:

1. Product details 
2. Fabric content
3. Print design

I'd like to write each one once and apply it to specific products. Each product has a different combination of each. I know I can create a product template for each, but that would require too many templates. Does anyone know of an app that can apply a tab or just a block of copy to specific products? One that can also apply two or three different blocks of text to each product.