We need to turn on the tax tracking first to create the GST-RCM in QuickBooks Online (QBO).
1. Go to the Taxes menu and select Set up tax.
2. Set up the tax agency details including the name, 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 select Next.
3. Follow the steps to finish the setup and select Ok.
Once sales tax is set up, you'll see the Tax Centre. There's also a Tax/GST column on your sales and purchases forms.