1. Offer one gift per main product (BOGO) with sale offer:


https://treedify.com/selly/sale


Sample setting as screenshot below:




2. Offer gift based on quantity with wholesale offer:


https://treedify.com/selly/wholesale


https://treedify.freshdesk.com/en/support/solutions/articles/43000174962-set-up-quantity-breaks-volume-discounts


3. Offer gifts based on cart subtotal with motivator offer:


https://treedify.com/selly/motivators


Sample setting "Free gift for order over $200" as screenshot below:



* If there are some gift options, a popup with gift options will be shown for customers to select.