In Deals I added a New Section Called "Products" in which through Multi-select lookup, Products can be added from Products Module i.e., Getting Products from Products Module to Deals Module.The image is shown below:Now, when I select Products in that field, the Amount Field in Deals Module should automatically calculate the Total Price of the Products. But, the amount field in Deals Module is showing Manual Entry. The image is shown below:

So, anyone help me how to solve this problem.