Helloi have 3 cleints , i want to upgrade to QBO advanced for one cleint only , how do i make it

Hello r1353, Thanks for contacting the Community! you can upgrade your client's subscription in the subscriptions and billing section. We've left the steps below but also here is a help article with more detail.

1. In QuickBooks Online Accountant, go to Settings ⚙️ and then Subscriptions and billing.
2. Select the Accountant-billed subscriptions tab.
3. Look for your client's name.
4. Next to the client, select the arrow ▶ to display that client's product subscriptions.
5. Next to the product you wish to upgrade, from the Subscription actions ▼ dropdown, select Upgrade.

Any questions at all let us know.