How do I enter the correct the opening balance in qb?

My company started to use QuickBooks desktop premier recently, the fiscal year of my company is on Dec 31, therefore, it is a good idea to change the accounting system to QuickBooks. We sale service to our clients, therefore, we charge HST to our clients on invoice. at the same time, the vendors will charge me HST. Right now, I have questions on setting up the opening balance of my clients and vendors, how do I deal with unpaid invoices from clients and vendors with HST from last year in different system? when I type the amount in the opening balance, it does not ask me the HST amount. How do I reflect the amount of HST in opening balance of Clients and vendors? Thank you