First of all, you need to define your product group. You do this in the following Customizing activity:  Customer Relationship Management Master Data Products Special Settings for Sales Operations Define Product Groups .

In the above activity you can define up to five product groups. However, only one of them can be used in Marketing. To assign the product group to be used for a particular marketing project, you should go to the following Customizing activity:  Customer Relationship Management Trade Promotion Management Basic Data Products Assign Product Groups .

You now need to enter the product group as an attribute of the product. This needs to be done for all products in a product group. Choose  Master Data Product . Select your product and choose the Distribution Chains assignment block. In the Distribution Chain section, specify a sales organization. In the Sales Groupings section, select a Product Group ID.

Once the products have been updated with the product group, you can enter the product group in the Products assignment block in Marketing. You call up your marketing project and enter the sales area. You can then enter the product group under Products.