QB Issue Resolution:

“Cost” is your Cost entry; it does not relate only to Inventory. It would be your entry for anything you are tracking using Items. Please see my attachments.

Resolution for Issue 'How to enter info such as date cat. No. Cost what is it for' available: Yes (Solved).
Source: Intuit Community forum.

How to enter info such as date cat. No. Cost what is it for: 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 Cost entry
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Error Recovery for Cost entry [Canada]
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