To display only the proper lead sources based on the product category chosen, an administrator

should create a dependency between the Product Category field and Lead Source field on Lead

object. A dependency is a relationship between two picklist fields that restricts the values available in

one picklist based on the value selected in another picklist. For example, an administrator can create

a dependency that shows only Online Store and Social Media as lead sources if Product Category is

Shoes, but shows only Trade Show and Magazine as lead sources if Product Category is Apparel.

Creating a page layout for each category, creating business processes and record types for each

category, or creating a single business process with record types for each category will not display

only the proper lead sources based on the product category chosen. Reference:

https://help.salesforce.com/s/articleView?id=sf.customize_dependent.htm&type=5