Jumping in to answer your questions, fpadilla.
Currently, the Projects feature is currently offered in QuickBooks Online US, Australia, United Kingdom, Canada, and South Africa. You might want to consider adding projects as sub-customers while this option is unavailable in QBO Philippines.
Please check out this guide article about adding sub-customers if you want to use that option: How to add a customer or sub-customer.
You can always visit us again in the Community if you have other questions.