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We can choose the Other option for you to enter a custom dollar amount. See the screenshot below for your reference: 

When paying an invoice with an active QuickBooks Payments subscription, your customers can tip 5%, 10%, 15%, or a custom dollar amount. Please keep in mind that this is only available in the new invoice and estimate experience. Here's how to turn tips on:

1. Go to the Gear icon and select Account and settings.
2. Click Sales, and in the Sales form content, select Edit.
3. Turn Tips (Gratuity) on.
4. In the Who's receiving these tips? window, choose an option between My Team and Just me.
5. Click Update.
6. Press Save, and Done.

Please also follow these steps to manage tip settings from an invoice:

1. Go to + New and select Invoice.
2. Click ⚙ Manage, then select Payment methods.
3. You can switch Accept tips on or off for this invoice only.
4. You may also turn tips on or off for future invoices. Under Accept tips, click Manage settings. Choose Who gets tipped and turn tips on or off.
5. Click Save. 

When you email customers an invoice with tips turned on, they’ll see tip options as they enter their payment method.

Customers may select to tip 5%, 10%, 15%, a custom dollar amount, or none. Feel free to visit our Sales and customers page for more insights about managing your customer transactions.

Let me know if there's anything else you need help with managing your customer's entries or other QuickBooks-related concerns. I'm always here to help you anytime. Take care and keep safe!