Create a one-to-many (1:M) relationship between Salesperson and Customer

Create a bridge entity between Order and Product and name it ProductOrder 

The primary keys of Order and Product together become composite key for the bridge entity named ProductOrder

Create a many-to-many (M:N) relationship between Customer and Order

Create a one-to-many (1:M) relationship between Customer and Order

Add the primary key of Customer as a foreign key in Salesperson 

Identify other additional attributes and add them to their corresponding entities as necessary to complete the ERD

Add the primary key of Customer as a foreign key in Order

Add the primary key of Salesperson as a foreign key in Customer

Create one-to-many (1:M) relationships linking Product and Order to the bridge entity ProductOrder 

Create one-to-many (1:M) relationships linking Customer and Order to the bridge entity CustomerOrder 

Add the primary key of Order as a foreign key in Customer 

Add the primary key of Order as a foreign key in Product

Add the primary keys of Customer and Order as foreign keys in the bridge entity named CustomerOrder 

Create a bridge entity between Customer and Order and name it CustomerOrder

The primary keys of Customer and Order together become composite key for the bridge entity named CustomerOrder

Add the primary keys of Order and Product as foreign keys in the bridge entity named ProductOrder

Create the entities Salesperson, Customer, Order and Product

Create a one-to-one (1:1) relationship between Salesperson and Customer

Create a one-to-many relationship between ITEM and BRANCH.

 Create a foreign key in entity ITEM to represent the recursive relationship

The primary key of BRANCH appears in COMPOSITION entity as a foreign key

Replace the primary key of ITEM with a composite key.

The primary keys of both ITEM and BRANCH are added as foreign keys to the entity SALE.

Identify additional entities and attributes as necessary to complete the ERD 

The primary key of SALE appears in BRANCH as a foreign key

Create a one-to-many relationship between ITEM and the SALE entity

Choose an appropriate primary key for the SALE entity.

Separate the attribute Address into non-decomposable attributes

The primary key of SALE is added as a foreign key in ITEM.

Create a recursive relationship between the ITEM entity and itself.

Create a bridge entity between ITEM and BRANCH name it SALE.

The primary key of BRANCH appears in ITEM as a foreign key

Create a one-to-many relationship between BRANCH and the SALE entity

The primary keys of both SALE and ITEM are added as foreign keys to the COMPOSITION entity.