Allow me to share with you some insights about adding projects in QuickBooks Online.
You can set up and create projects in QuickBooks Online (QBO) Plus, Advanced, and Accountant. This helps you stay organized and track your business transactions. However, being able to create a new project from a project is currently available. You can only select a customer name on the project created.
As a workaround, you can either use the location/class tracking feature to categorize your data from a different location, offices, region, departments, and others. For your guide, I recommend checking out these articles: