Short answer is that you would need to modify this module to support displaying cross sell items in the shopping cart..

From the module description (please note the highlighted portion):

How Does Advanced Cross Sell Work??
=============================
The shop sells Walkmans.. If the shopowner/administrator adds cross sell products to the Walkman product via the Advanced Cross Sell interfaces, the product page will now includes a new centerbox.. "may we also recommend batteries, case cd's etc."
Quote Originally Posted by edbeck View Post
Cross-Sell Items not appearing after adding main item to cart. http://secure.edbeckphotography.com/shop

Zen Cart? 1.5.4
Is it a new install or an upgrade? New
What the addons/contributions you have installed? Tableau, Cross Sell Advanced v1.3 (This is the only version of Cross-Sell I've installed. The forum says that I don't need the previous version installed even though previous versions did.)
What customizations have you made? Just adding products and images through the admin panel.
What type of server are you using? inMotion Apache v. 2.2.27
Are you installing locally? No
What operating system? linux
What version of PHP is installed on the server? 5.3.28
What version of MYSQL is installed on the server?5.6.23
What you were doing when your problem occurred? Added product to shopping cart.
What are the steps to reproduce the problem?
1. go to https://secure.edbeckphotography.com/shop
2. Under "Categories" select "Real Estate Photography"
3. Select the "Up to 1,999 sq. ft. product and add to the cart.
4. The shopping cart summary appears, I expected the cross-sell products to be displayed. The cross-sell products for any of the houses are "Overnight Delivery" and "Mobile Web Site".

Have you attempted to fix the problem? Yes, though reading and trying different settings,

What steps have you taken?


Configuration:
Cross Sell Advanced
Title Value Action
Display Cross-Sell Products Minimum 1 Info
Display Cross-Sell Products Maximum 6 Info
Cross-Sell Products Columns per Row 3 Info
Cross-Sell - Display prices? true
Cross Sell Advanced Version 1.3 Info


Current Cross-Sells

Product Name No. of Current Cross-Sells Action
Up to 1,999 sq.ft. 2 Edit Cross Sell Delete Cross Sell
2,000 - 2,999 sq. ft. 2 Edit Cross Sell Delete Cross Sell
3,000 - 4,499 sq. ft. 2 Edit Cross Sell Delete Cross Sell
4,500 - 5,999 sq. ft 2 Edit Cross Sell Delete Cross Sell
6,000 - 7,500 sq. ft 2 Edit Cross Sell Delete Cross Sell
Academic Year Subscription 1 Edit Cross Sell Delete Cross Sell
Banquet Posters 2 Edit Cross Sell Delete Cross Sell
Package A - Ultimate 6 Edit Cross Sell Delete Cross Sell
Package B - Deluxe 6 Edit Cross Sell Delete Cross Sell
Package C - Classic 6 Edit Cross Sell Delete Cross Sell
Package D - Basic 6 Edit Cross Sell Delete Cross Sell


Displaying 1 to 20 (of 23 products) << Page of 2 >>
Product Id Product Name Current Cross-Sells Update Cross-Sells
2 Up to 1,999 sq.ft.
1. Overnight Delivery (before noon the next day)
2. Mobile Web Site

How do I get the cross-sell products to display after a customer selects and adds a product to the shopping cart?

Thanks