How do i record inventory for retail sale being used in the projects that we do. Does the PO I create for projects affects my inventory for sale?

Let me help you in setting this up, Marlon-Landicho.

Recording of an inventory item is done through the Products and Services section in QuickBooks Online. Here's how:

1. Click Sales on the left pane.
2. Select Product and Services.
3. Click New, then select Inventory.
4. Enter the inventory item information, then click Save and close.

When you create a purchase order, it doesn't affect your inventory since it's a non-posting transaction. 

Check out these articles for more information:

• Set up and create projects in QuickBooks Online
• Create purchase orders in QuickBooks Online

I'll be right here if you have more questions.