QB Issue Resolution:

Currently, we’re unable to split an expense transaction by percentage. You’ll have to calculate the amount manually.

 

I can send a product suggestion directly to our engineers. They can consider this feature added in the future update.

 

I’ve also added this article for future reference: Help articles for QuickBooks Online.

Resolution for Issue 'How do you split an expense transaction by a percentage?' available: Yes (Solved).
Source: Intuit Community forum.

How do you split an expense transaction by a percentage?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for expense transaction
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Error Recovery for expense transaction [Canada]
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