In ShopFactory, you can setup cross-promoted products that targets buyers of a product with an offer to purchase a related product. For example, a customer buying a shirt can see some 'Related Products' of a pair of pants  and shoes that coordinate with the shirt.  This aims to target buyers during the purchasing process with suggestions on related products.

A) Bulk update products with "Related Products"

1: Setup a product with the list of "Related Products" on a department

- At the left-tree menu, select Homepage or any department in Navigation 2

- Click Add product button

- Click Properties -> Related Products

- Add the products you want to cross-promote

Refer to this article for detailed steps,  Adding Related products (Cross promotions)

2: Move the product to "Product Templates"

- Select the product and click CTRL+X (Cut)

- At the left-tree menu, select Product Templates

- Paste (CTRL+V)

3: Bulk copy 'Related Products' to multiple items in your shop

- Go to List of Contents or select a department/page where you want these Related Products to be applied.

- If you are on a page/department, click  "Manage Products" to switch to Items List mode. 

- Select the products by pressing CTRL key and clicking  each of the products 

- Right-click on the selection -> at the shortcut menu, click Copy  Values from a product template to all selected products

- Tick "Related Products" checkbox then click OK

- Click Yes to confirm you want to proceed 

- Click OK

- Save and preview in External browser; check the product detailed page to verify the Related Products section has been populated

- Publish your shop again so the changes are uploaded online.

B) Removing all 'Related Products' in several products

- Create a product that doesn't have related products by clicking on Add Product button

- Move this product to "Product Templates" category 

- Go to List of Contents or to the department/page and then select all the products you want to bulk delete the "Related Products" 

- Select the products by pressing CTRL key and clicking  each of the products 

- Right-click on the selection -> at the shortcut menu, click Copy  Values from a product template to all selected products

- Tick "Related Products" checkbox then click OK

- Click Yes to confirm you want to proceed and then click OK

- Save and preview in External browser; check the product detailed page to verify the Related Products section doesn't show

- Publish your shop again so the changes are uploaded online.

See the related Help article on how to save time updating your products and work with product templates in general:

https://help.shopfactory.com/contents/en-us/d174.html