If you have multiple different products that you sell to your customers, you can run automation to quickly identify customers who are showing interest in more than just one product. You can also send targeted emails to such leads/customers to improve your conversions.
For example, suppose you have a sublist of contacts interested in Product 1 and another sublist of contacts interested in Product 2, you can create the following type of rule to reach out to contacts who show interest in both the products.
While this is an example of finding contacts interested in more than one product, it can similarly be used to identify contacts who are part of multiple sublists. Businesses often have sublists based on Services offered, Industry types, Stakeholder Type (Customer/Partner/Prospect/Investor/others). Using a simple rule, you can filter your contacts easily and run targeted marketing activities to such contacts.