QB Issue Resolution:

yes, about half way down the page on the left is items with an arrow, click the arrow and it open so you can list items

Resolution for Issue 'in 2012 Quickbooks Pro you were able to itemize your vendor bills, is this possible with quickbooks online' available: Yes (Solved).
Source: Intuit Community forum.

in 2012 Quickbooks Pro you were able to itemize your vendor bills, is this possible with quickbooks online: 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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