Complete part4 for suite bookstore tutorial

docs/en/tutorials/book-store-with-abp-suite/part-04.md

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+# Web Application Development (with ABP Suite) Tutorial - Part 4: Book to Author Relation
+````json
+//[doc-params]
+{
+    "UI": ["MVC"],
+    "DB": ["EF"]
+}
+````
+````json
+//[doc-nav]
+{
+  "Previous": {
+    "Name": "Creating the Author",
+    "Path": "tutorials/book-store-with-abp-suite/part-03"
+  },
+  "Next": {
+    "Name": "Customizing the Generated Code",
+    "Path": "tutorials/book-store-with-abp-suite/part-05"
+  }
+}
+````
+
+In the previous parts, we have created the `Book` and `Author` entities (& generated code for all functionalities) for the book store application. However, currently there is no relation between these entities.
+
+In this part, we will establish to **one-to-many relation** between the `Book` and `Author` entities.
+
+## Establishing Relations with ABP Suite
+
+ABP Suite allows establishing both **one-to-many** and [many-to-many](../../suite/creating-many-to-many-relationship.md) relationships. 
+
+In this tutorial, we will only establish **one-to-many relation** between `Book` and `Author` entities. It's pretty straightforward to establish a relationship with ABP Suite. You should just need to navigate to the *Navigations* tab, and provide the metadata for navigation property (1-n) or navigation collection (n-n) relations.
+
+## Creating Book to Author Relationship
+
+> Please **stop the application** in ABP Studio's *Solution Runner* panel, because ABP Suite will make changes in the solution and it might need to build the solution in some steps and running the solution prevents to build it.
+
+To establish **one-to-many relations** between *Book* and *Author* entities, select the `Book` entity from the entity selection box on the top-right of the *CRUD page generation* page:
+
+![](./images/suite-book-entity-selection.png)
+
+Then, you can open the *Navigations* tab, and click the **Add navigation property (1-n)** button. After that, a navigation property model will be opened, and you can fill the inputs like in the following figure:
+
+![](./images/abp-suite-navigation-property.png)
+
+Here is the details:
+
+* Selected the entity as `Author`. (ABP Suite will establish one-to-many relation between *Book* and *Author* entities with this configuration)
+* Set the property name as *AuthorId*, it will be set as foreign-key restriction in the database and all related database configurations will be made by ABP Suite.
+* Selected the display property as *Name*, this will be used in the dropdown component, to set an author with a book. 
+* Also, made the relation **required** and also made it **filterable** so books can be filterable by authors.
+
+After, specifying the metadata, you can click the *Ok* button to close the modal. Then, click the **Save and generate** button to start code generation process. ABP Suite will establish one-to-many relationship between the entities, and will generate all necessary code automatically:
+
+![](./images/suite-end-of-generation-modal.png)
+
+It will take some time to complete the process. After the process is completed, you will see a success message, you can click the *Ok* button, and build & start the application by clicking the *Run -> Build & Start* button in the *Solution Runner* panel:
+
+![](./images/suite-book-entity-6.png)
+
+After the application is started, you can right-click and *Browse* on the application to open it in the ABP Studio's pre-integrated browser. You can first create an author and then create a book with the author:
+
+![](./images/suite-book-with-author-create-modal.png)
+
+Also, notice that, in the advanced filter section, there is an **Author** dropdown, which you can use to filter books by authors (remember we set **filterable** while defining navigation property and thanks to that, ABP Suite generated the code accordingly):
+
+![](./images/suite-bookstore-advanced-filter-section.png)
+
+## Summary
+
+So far, we have created the all functionality for the bookstore application without needing to write any single line of code. ABP Suite generated the entities, application services, UI components, unit & integration tests and more...
+
+In the next part, we will write some code and modify the ABP Suite's generated code by writing the code in the specified hookpoints. Thanks to [ABP Suite's Customized Code Support](../../suite/customizing-the-generated-code.md), in the next generation, our custom code will not be overridden and will be preserved.

docs/en/tutorials/book-store-with-abp-suite/part-05.md

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+# Web Application Development (with ABP Suite) Tutorial - Part 5: Customizing the Generated Code
+````json
+//[doc-params]
+{
+    "UI": ["MVC"],
+    "DB": ["EF"]
+}
+````
+````json
+//[doc-nav]
+{
+  "Previous": {
+    "Name": "Book to Author Relation",
+    "Path": "tutorials/book-store-with-abp-suite/part-04"
+  }
+}
+````