QB Issue Resolution:

you will have to find some manual workaround, QBO does not do job costing

QBDT to QBO limitations
https://qboe.custhelp.com/app/answers/detail/a_id/4095

Resolution for Issue 'Job entries into QBO as like Quickbooks 2012-2013. I am unable to find where to enter customer jobs in the customer card like I did in Quickbooks 2012-2013 – HELP please.' available: Yes (Solved).
Source: Intuit Community forum.

Job entries into QBO as like Quickbooks 2012-2013. I am unable to find where to enter customer jobs in the customer card like I did in Quickbooks 2012-2013 – HELP please.: 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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