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Buy nowHello there, @Reaksmeysk.
I appreciate you reaching out to us. I'd be glad to provide answers to your QuickBooks Online (QBO) Advanced queries.
For your first concern, the amount field can reach up to 11 max digits.

Moreover, yes, you can type Khmer fonts in the description or memo field. See the sample screenshot below:

With regard to your final concern about Khmer currency (KHR), yes, it's also available in the QuickBooks software. You'll just have to enable the multicurrency feature and then add the KHR to the list of your currencies.

Feel free to check out this article for more information about using multicurrency in QBO Advanced: Set up and use multicurrency in QuickBooks Online.
Here's a sample screenshot of an invoice with a KHR currency and Khmer fonts in the description/memo field.
Additionally, feel free to visit this page to see the list of available features in QuickBooks Online Advanced: QBO Advanced features.
Keep me posted if you still have questions or concerns about setting up your QBO Advanced account. I'm always here to lend a helping hand. Have a wonderful day ahead!