While reading about marketing I got something about cross selling which I want to share with you:

Cross Selling

Cross-sell is a marketing term for the practice of suggesting related products or services to a customer who is considering buying something

The objectives of cross-selling can be either to increase the income derived from the client(s) or to protect the relationship with the client(s). The approach to the process of cross-selling can be varied. Unlike the acquiring of new business, cross-selling involves an element of risk that existing relationships with the client could be disrupted. For this reason it is important to ensure that the additional product or service being sold to the client(s) enhances the value the client(s) get from the organization

When you cross-sell, you offer the customer a product or service related to whatever they are already buying. It can be as simple as the waiter asking if you want a salad to go with your main course

The key to successful cross-selling is to focus your efforts on meeting the customer’s needs, rather than simply pushing more products and services. This is one area of startup marketing where you may need to do a little experimentation in order to find just the right balance, but you need to make cross selling a key component of your list of sales techniques.

Cross-Selling Dos

• Show relevant items whether they are accessories or alternatives to the same product
• Show larger sizes or other same-product up-sells when possible
• Use personal words like “you” rather than “we” - “You Might Also Like” vs. “We Suggest”
• Use emotional words like “need” and “want” (Examples: Palm. “Need accessories?” and McDonald’s “Do you want fries with that?”)
• Use words like “Special Offers,” “Special Offers for You” or “Great Deals” to communicate savings and value
• Create urgency with “Limited Time Offer” or “Limited Quantities” (Example: Tiger Direct)
• Do save your sale / low margin items for the view cart page. Show regular priced / high margin alternatives from the product pages.
• Make it easy to return to the product page after you add a suggested item - even better to keep shopper on the product page but clearly let the shopper know an item was added to the cart
• Offer a mix of price points when suggesting items on the view cart page
• Show “no brainers” like gift cards, warranties, batteries et cetera that are easily understood by the customer, don’t require a click away from the page and are easy sellers
• Offer discounts on one item when you buy another item on the “view cart/bag/basket” page (Examples: Blue Nile and Macy’s)
• Provide enough detail on add-ons (thumbnail, price and description) so customer is less likely to click away from cart page
• Let the customer check off add-ons from the view cart page rather than buttons for each product. Customers may think adding a product to the cart will take them away from the cart page and they’ll get lost (Example: Palm.com)
• It’s a good idea to show “top rated” suggestions along with review content to build trust and catch interest. I haven’t found an example of this, please comment if you’ve seen one

Cross-Selling Don’ts

• Don’t show random items totally unrelated to the product (Guilty: Sharper Image)
• Don’t clutter your page with every offer you have (Guilty: Tiger Direct)
• Don’t suggest competing products on the view cart page - this only encourages indecisiveness and can ruin your conversion
• Don’t show out-of-stock items unless backorders are available

Hope it will be liked by you....