1.Creating and Managing Warehouses:

• To create a new warehouse or to manage an existing warehouse on the Magento admin panel, click on Stores > Inventory > Sources 

After click on sources this screen opens for add the sources :

• 

On the sources screen, add Add new source

After the add details in new source -General, contact info and Address data click on save and continue.  

After the Sources save:

2.For Managing stocks :
Click on Stores > Inventory > Manage Stock and Add stock :

Then, assign the sources, click on save and continue.

3.Transfer and Managing Products to source:
After creating source and managing the stock next steps is Transfer inventory to source :

Here are the steps for transfer products to source:

1.Select the products and Click on Transfer products to source

2. Click on Action button and Choose Transfer Inventory to source:

3. After that select sources :

Backend: 
Products – Assign to source
1.Joust Duffle Bag – Singapore 2.Clamber Watch – Jaipur3.Cruise Dual Analog Watch- Delhi

On frontend: Customer Add these 3 products into the cart:

After proceed the checkout, only 3 orders will be created :

These orders are as per assign warehouse sources Delhi, Jaipur and Singapore.