If you're to set up the company's head office details, as well as its warehouses, you can do it through General settings within the Settings module in Odoo.

To Customize the Main Company Settings

1. Go to Settings > General Settings > Companies > Update Info

2. Update the details: 

• Company Name: Self Explanatory (SE)
• Address:  SE
• Phone:  SE
• Email:  SE
• Website:  SE
• TAX ID: Australian TFN
• Company Registry: Company Domain
• Currency:  SE

3. Click on Save.

To Set Up Other Companies

1. Go to General Settings > Companies > Manage Companies > Create

2. Fill in the details:

• Company Name: Self Explanatory (SE)
• Address:  SE
• Phone:  SE
• Email:  SE
• Website:  SE
• TAX ID: Australian TFN
• Company Registry: Company Domain
• Currency:  SE

3. Click on Save