If you want to manually select which products/variants to show on the slider widget, product mapping is what you need. Product mapping sets on which product the slider widget will show (source products), and which products to show in the slider widget (destination products).
Product mapping is usually used to cross-sell products.
Mapping rules are additional rules that decide when to show this product mapping.
Show on product page checkbox: whether to show the mapping on all product pages
Show on cart: whether to show the mapping on the cart page
Show only above total cart price: The minimum threshold (in your shop currency) to show the mapping
Show only below total cart price: The maximum threshold (in your shop currency) to show the mapping
Show only above cart items count: The minimum number of products in the cart in order to show the mapping
Show only below cart items count: The maximum number of products in the cart in order to show the mapping
When you're done, click "Next" to configure the final settings for this mapping:
Finalizing the mapping
We're almost done:
Name: This name is only for your eyes, it won't be displayed on site.
Title: override the title from the slider settings with a specific title for this mapping.
Subtitle: override the subtitle from the slider settings with a specific subtitle for this mapping.
Discount on destination products: Give a discount on the slider items (destination product) if the buyer has at least one source product in his cart. The discount is given only on the destination products and not on the source products.
Minimum slider items purchased for discount: Give the discount only if the cart has at least this number of destination products in it (not including of course at least one source product)
Maximum slider items purchased for discount: Give the discount on a maximum number of destination products (when at least one source product is present). Any additional destination products that are in the cart won't receive a discount.
Click "Save" to save this mapping and wait for the changes to be published on your site (the blue progress bar on top).