You can entry transactions in QuickBooks Online (QBO) for GST payments by making the item taxable.
QBO will automatically track your sales tax for you through the Tax feature. To use this feature, you'd need first to turn it on, then create your tax codes as necessary.
Turn on tax tracking
Click Tax on the left menu, then select Set up tax.
Set up the tax agency details such as the name of your tax agency, any official tax number that has been assigned to your company, your reporting method, how often you file your tax to your tax agency, and whether this tax is meant for sales or purchases, then click Next.
Follow the steps to finish the setup and select Done.
Once the sales tax is set up, you'll see the Tax Centre. Also, the Tax/GST column appears on your sales and purchase forms.
Add tax rates
In the Tax Centre, select Add Tax.
Choose which type of tax rate you want to set up.
Enter the details of your tax rate. If you need help with this screen, select the help button (yellow question mark).