Muhammad first uses the attribute brand to select products for the brand and then uses the attribute category to create separate product groups for hats and shirts wants to promote hats and shirts from the same brand. His next step is to set bids for his new product groups to align with his sales strategy.
Explanation: Your campaign structure is the foundation for driving your objectives. Think about what you want to accomplish across your different product areas and how you can organize your entire product inventory to align with these varied goals.
Create relational ad/product group divisions in a tiered, broad-to-narrow structure. This approach will Align bid management to your objectives. It gives your bidding system more ad/product group data to inform bid optimizations.
Read more here: https://support.google.com/adwords/answer/6167176