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You can use categories and keywords for classifying certain types of content like pages of different products in your example.

So, in your example the department/electronics will be the category and TV, PC etc will be keywords. On keywords classify the banner components like PC keyword will have PC banner component classified on the keyword.

On save of a page in a certain structure group like "PC", automatically classify the appropriate keyword using event system to the newly created page. Create the banner components as a dynamic components so that you don't have to publish pages everytime you change banner images for example. Now, from DD4T you will be able to get the classified keyword on each page which will have the TCM uri of the banner component. You can query for the same using TCM uri and render the same in any page by calling render dynamic component method from DD4T. This logic of getting and including the dynamic component will be on your page template (which can be c# razor view or its equivalent in Java)

You can use categories and keywords for classifying different types of content like pages of different products in your example.

So, in your example the department/electronics will be the category and TV, PC etc will be keywords. On the keywords classify the banner components like PC keyword will have PC banner component classified on the keyword.

  On save of a page in a certain structure group like "PC", automatically classify the appropriate keyword using the event system to the newly created page.

Create the banner components as a dynamic components so that you don't have to publish the pages everytime, when you change banner images in the banner components.

Now, from DD4T you will be able to get the classified keyword on each page which will have the TCM uri of the banner component. You can query for the same using TCM uri and render the same in any page by calling render dynamic component method from DD4T. This logic of getting and including the dynamic component will be on your page template (which can be c# razor view or its equivalent in Java)

you can use categories and keywords for classifying certain types of content like pages of different department in your example.

So, department is the category and then TV, Audio etc as keywords. On keywords classify the banner components. On save of a page in certain structure group, automatically classify the appropriate keyword using event system. Create that component as dynamic component. Now, from DD4T you will be able to get the classified keyword on the page which will have the TCM uri of the banner component and you can render the same on your page.

You can use categories and keywords for classifying certain types of content like pages of different products in your example.

So, in your example the department/electronics will be the category and TV, PC etc will be keywords. On keywords classify the banner components like PC keyword will have PC banner component classified on the keyword.

On save of a page in a certain structure group like "PC", automatically classify the appropriate keyword using event system to the newly created page. Create the banner components as a dynamic components so that you don't have to publish pages everytime you change banner images for example. Now, from DD4T you will be able to get the classified keyword on each page which will have the TCM uri of the banner component. You can query for the same using TCM uri and render the same in any page by calling render dynamic component method from DD4T. This logic of getting and including the dynamic component will be on your page template (which can be c# razor view or its equivalent in Java)

Based on what I understood from the question, you can do the below:

Create DCPs for common components (like Header, Footer etc.) which are present on all pages or most of the pages and include them directly in your page templates with RenderDynamicComponent presentation method from DD4T. This will ensure that the pages do not need republish when you changes any of the DCPs and they are still present on the page. We use this approach for Header and Footers components and we use DD4T as well. This works absolutely fine.

you can use categories and keywords for classifying certain types of content like pages of different department in your example.

So, department is the category and then TV, Audio etc as keywords. On keywords classify the banner components. On save of a page in certain structure group, automatically classify the appropriate keyword using event system. Create that component as dynamic component. Now, from DD4T you will be able to get the classified keyword on the page which will have the TCM uri of the banner component and you can render the same on your page.