Record types allow you to assign different page layouts, picklist values, and business processes to different users based on their profiles. You can create three record types for the three product lines, and assign them to the appropriate sales teams. You can also create three sets of opportunity stages that reflect the unique sales methodologies for each product line, and associate them with the corresponding record types. This can help you customize the Sales Cloud functionality for each product line and track their progress separately. Verified Reference:
https://developer.salesforce.com/resources2/certification-site/files/SGCertifiedSalesCloudConsultant.pdf (page 17)
https://help.salesforce.com/s/articleView?id=sf.customize_recordtype.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.customize_opptystages.htm&type=5