QB Issue Resolution:

By using Billable Expenses you can mark expenses to be billed to certain customers and you can even assign splits to multiple customers within same expense. Then you would add these charges in invoicing the customers. Even if not invoiced you still can run a report that includes billable but not invoiced by customer

Resolution for Issue 'can I generate a report with specific sales and expenses for a specific customer ?' available: Yes (Solved).
Source: Intuit Community forum.

can I generate a report with specific sales and expenses for a specific customer ?: 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 billable expenses
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Error Recovery for billable expenses [Canada]
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