Thank you for reaching out to Quickbooks Community. I will walk you through a quick guided step to help you add PST to your invoice. Hopefully, this should solve your issue and you will be on the right track in no time.
Follow these steps:
You can quickly add sales taxes like (PST) to invoices, sales receipts, estimates, and credit memos when creating an order.
Firstly
Under the Tax column, check the taxable products and services.
At the bottom right, select the appropriate sales tax. Note: To add a new sales tax item, choose Add New.
Select Save.
You can check out this link as well or always reach out to us if you need more information and help.
Welcome to the QuickBooks Community. I'm sure you'll find it a great wealth of information and support. I lead you through the path of adding PST to an invoice.
It isn't clear which part you need assistance with, so I've provided articles for the whole process, starting from setting up the provincial tax agency, setting up the sales tax and creating the invoice.