If you are asking how to display the Job ID column on a General Ledger Report, just click the columns button when viewing the report and then check the Show box next to Job ID.

If you've already added the Job ID column, keep in mind that only the income side of an AR invoice or the expense side of an AP invoice get assigned to the job. So you won't see the Job ID when looking at the AR or AP account on a General Ledger Report. It works the same way for payments, the expense side of a check/payment posts to the job but the credit to cash does not.

I am looking at a GL Report for an expense account.  Should the Job ID show up on it?

If you have added the Job ID column to the General Ledger Report the, yes, the report should show the job that the line is assigned to.

Yes, if the item is paid.

Yes, I did add the Job ID column to the report.  Any item that was put in the purchase journal, then paid, does not show the Job ID associated with it.