Can I add targets to line items?

Yes, you can set up targets at the product line item field level for Deals, Sales Orders (SO), Quotes, Invoices, etc.

With this, a salesperson responsible for selling a product with a target attached to it can achieve the target through Deals, SO, Quotes, or Invoice line items. 

You can also set up targets for a group of products or services by using the Group Wise field.