QB Issue Resolution:

in company settings>expenses>bills & expenses turn on the items table and purchase orders.

When you enter an expense or bill, about half way down the left side is a title “item Details” click that and a table opens where you can select the item, qty and item total cost for purchasing inventory

Resolution for Issue 'How do I enter inventory items on a bill' available: Yes (Solved).
Source: Intuit Community forum.

How do I enter inventory items on a bill: 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.

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