Why i cant see tax setup for SST, its only showing for agency GST?

Hello, jesvin-kaur-mind. 

I have a way to help you set up SST in QuickBooks Online. 

The international versions of QuickBooks Online are generally set up for GST. You can set up a custom tax rate or agency for your SST from the Taxes page. Here's how: 

1. Go to Taxes.
2. Click the Add tax button, then select Custom tax.
3. Set the Tax name as SST.
4. Enter a description for your SST tax.
5. Set the Tax agency to the name of the agency that collects the tax.
6. Add other information such as Business registration number, Filing frequency, etc..
7. Ensure the This tax is collected on sales box is checked.
8. Enter the rate, then click Save. 

Also if you're using the Malaysian version, you might want to read this article if you have an SST charge on your subscription plan: Why do I see a SST charge for my QuickBooks Online plan?. 

If you'd like to learn more about setting up your taxes, this article can help you out: Set up tax. 

Ready to create your invoices for your customers? If you need help, you can always take a look at this article: Create invoices in QuickBooks Online.

Do you have more questions about your taxes or setting up your QuickBooks Online? Please let me know what you need to do, and I'll help you complete your tasks.